perl regular expression cheat sheet

Perl is a general-purpose, high level interpreted and dynamic programming language. It is implied, without doing anything its just how the language works. The transitions without consuming an input symbol are called ∈-transitions. The /g modifier allows for global matching. A MySQL subquery is called an inner query while the query that contains the subquery is called an outer query. It matches at the specified position pos(). Some of the programmers also refer Perl as the Pathologically Eclectic Rubbish Lister Or Practically A regular expression is a string of characters that defines the pattern or patterns you are viewing. It allows continued search after \g match fails. The basic method for applying a regular expression is to use the pattern binding operators =~ and !~. Using m// and Binding Operators: Mostly the binding operators are used with the m// operator so that required pattern could be matched out. Practice Problems, POTD Streak, Weekly Contests & More! The DFA corresponding to given regular expression is given in Figure 5. What are the Best Ways to Write a SQL Query? It matches that the characters a and b should not be followed by c, d and e. It matches for [\f\t\n\r] i.e form feed, tab, newline and carriage return. The next two columns work hand in hand: the "Example" column gives a valid regular expression that uses the element, and the "Sample Match" column presents a text string that could be matched by the regular expression. The REPLACEMENT is a specification for the text or regular expression that we want to use to replace the found text with. Given string str, the task is to check whether the given string is valid GUID (Globally Unique Identifier) or not by using Regular Expression. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Theory Of Computation and Automata Tutorials, Chomsky Hierarchy in Theory of Computation, Regular Expressions, Regular Grammar and Regular Languages, How to identify if a language is regular or not, Designing Finite Automata from Regular Expression (Set 1), Program to Implement NFA with epsilon move to DFA Conversion, Union and Intersection of Regular languages with CFL, DFA of a string with at least two 0s and at least two 1s, DFA machines accepting odd number of 0s or/and even number of 1s, DFA for accepting the language L = { anbm | n+m=even }, Star Height of Regular Expression and Regular Language, Difference between Mealy machine and Moore machine, Pushdown Automata Acceptance by Final State, Check if the language is Context Free or Not, Construct Pushdown Automata for given languages, Construct Pushdown automata for L = {0n1m2(n+m) | m,n 0}, Construct Pushdown Automata for all length palindrome, NPDA for the language L ={w∈ {a,b}*| w contains equal no. It was developed by Larry Wall, in 1987. of as and bs}, NPDA for accepting the language L = {an bn | n>=1}, NPDA for accepting the language L = {an bm cn | m,n>=1}, NPDA for accepting the language L = {am b(2m) | m>=1}, Construct Pushdown automata for L = {a(2*m)c(4*n)dnbm | m,n 0}, NPDA for accepting the language L = {ambnc(m+n) | m,n 1}, NPDA for accepting the language L = {amb(m+n)cn | m,n 1}, NPDA for accepting the language L = {amb(2m+1) | m 1}, Closure Properties of Context Free Languages, Ambiguity in Context free Grammar and Context free Languages, Converting Context Free Grammar to Chomsky Normal Form, Converting Context Free Grammar to Greibach Normal Form, Relationship between grammar and language in Theory of Computation, Context-sensitive Grammar (CSG) and Language (CSL), Recursive and Recursive Enumerable Languages in TOC, Construct a Turing Machine for language L = {0, Construct a Turing Machine for language L = {ww, Construct a Turing Machine for language L = {ww | w ∈ {0,1}}, Proof that Hamiltonian Path is NP-Complete, Decidable and Undecidable problems in Theory of Computation, Computable and non-computable problems in TOC, Practice problems on finite automata | Set 2, Context free languages and Push-down automata, Recursively enumerable sets and Turing machines. 2. For 0111, the automata will go from q0 to q0, then q0 to q1, then q1 to q0 and finally q0 to q1, hence rejected. Thanks a lot for the quick guide. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. which are used in regular expression. The basic method for applying a regular expression is to use the pattern binding operators =~ and !~. These are used to check for the special characters. Practice Problems, POTD Streak, Weekly Contests & More! It is used for searching the specified text pattern. Unlike lots of other cheat sheets or regex web sites, I was able (without much persistent regex knowledge) to apply the rules and to solve my problem. Feeling hardcore (or crazy, you decide)? For example , The last modifier, /s, removes the duplicate sequences of characters that were replaced, so , You don't just have to match on fixed strings. But elsewhere it says < and > are metacharacters and must be escaped (to \< and \> ) to match them literally, which not true in any flavor In this operator, the required pattern is simply placed between the two slashes and the binding operators are used to search for the pattern in the specified string. Regular Expression: A Regular Expression is an object that describes a pattern of characters. Javascript's engine is close to that and PHP also has Perl Compatible functions for Regex; they use the PREG prefix. Regular expression, languages, grammar and finite automata, Context free languages, grammar and push down automata, Designing Finite Automata from Regular Expression (Set 6), Designing Finite Automata from Regular Expression (Set 2), Designing Finite Automata from Regular Expression (Set 3), Designing Finite Automata from Regular Expression (Set 4), Designing Finite Automata from Regular Expression (Set 5), Designing Finite Automata from Regular Expression (Set 7), Designing Finite Automata from Regular Expression (Set 8), Conversion of Regular Expression to Finite Automata, Generating regular expression from Finite Automata, Designing Non-Deterministic Finite Automata (Set 3), Designing Deterministic Finite Automata (Set 2), Designing Deterministic Finite Automata (Set 3), Designing Deterministic Finite Automata (Set 4), Designing Deterministic Finite Automata (Set 5), Designing Deterministic Finite Automata (Set 9), Designing Deterministic Finite Automata (Set 8), Designing Deterministic Finite Automata (Set 7), Designing Deterministic Finite Automata (Set 6), Designing Deterministic Finite Automata (Set 10), Designing Deterministic Finite Automata (Set 11), Designing Non-Deterministic Finite Automata (Set 1), Designing Non-Deterministic Finite Automata (Set 5), Designing Deterministic Finite Automata (Set 1), Designing Non-Deterministic Finite Automata (Set 4), Complete Interview Preparation- Self Paced Course, Data Structures & Algorithms- Self Paced Course. Writing code in comment? Please use ide.geeksforgeeks.org, Programs can be written in Perl in any of the widely used text editors like Notepad++, gedit, etc. The attribute regexp takes the regular expression to be matched. Matches 0 or 1 occurrence of preceding expression. instead of using [^A-Za-z], used [0-9] and getting the same result as above, If there are no numeric, 0 will be displayed for NumericPosition. I once stumbled upon and missed it, now found again So happy :D Thank you so much for all your efforts!! Sometimes it is termed as Perl 5 Compatible Regular Expressions.To use the Regex, Binding operators like =~(Regex Operator) and !~ (Negated It can be used with other functions also and it will help to get only alphabets from an input string/numerals from an input string. Regular Expression to . ∈-NFA is similar to the NFA but have minor difference by epsilon move. These are used to group without capturing. Used for inserting horizontal white space. The most common flavor is Perl Compatible Regular Expressions (PCRE). The basic method for applying a regular expression is to use the pattern binding operators =~ and !~. If you are comfortable with any other delimiter, then you can use in place of forward slash. Java, Ruby 2+: character class subtraction is obtained by intersecting a class with a negated class. The basic method for applying a regular expression is to use the pattern binding operators =~ and !~. In this, set of characters together form the search pattern. A regular expression is a string of characters that defines the pattern or patterns you are viewing. For example, the following query uses a subquery to return the employees who work in the offices located in the USA. Here is the list of all the modifiers used with substitution operator. Approach: This problem can be used by using Regular Expression. The first operator is a test and assignment operator. Matches at least n and at most m occurrences of preceding expression. This is the go-to website for everything on regex. Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; @david, this cheat sheet is pretty neutral. Prerequisite Finite Automata Introduction, Designing Finite Automata from Regular Expression (Set 1). The syntax of regular expressions in Perl is very similar to what you will find within other regular expression.supporting programs, such as sed, grep, and awk.. Agree Regex or Regular Expressions are an important part of Perl Programming. a, b, c, or .. Anchors do not match any character at all. @david, this cheat sheet is pretty neutral. Practice Problems, POTD Streak, Weekly Contests & More! Regex operator is used to match a string with a regular expression. class Regex. Short for regular expression, a regex is a string of text that lets you create patterns that help match, locate, and manage text.Perl is a great example of a programming language that utilizes regular expressions. It should be 36 characters (32 hexadecimal characters and 4 hyphens) long. Searching for two peoples names could be achieved with two separate tests, like this . So we can say that the task of searching and extracting is so common that Python has a very powerful library called regular expressions that handles many of these tasks quite elegantly. Regex or Regular Expressions are an important part of Perl Programming. Regex or Regular Expressions are an important part of Perl Programming. For one a, it will go from q0 to q1 and the string will not be accepted. It is facilitating a lot my regex learning! Using m option allows it to match newline as well. Java, Ruby 2+: character class subtraction, An Arabic character that is not a letter or a number. However, its only one of the many places you can find regular expressions. It provides a single engine for DBAs, enterprise architects, and developers to keep critical applications running, store and query anything, and power faster decision making and innovation across your organization. (these neither set this $1 nor \1). The next column, "Legend", explains what the element means (or encodes) in the regex syntax. This chapter describes JavaScript regular expressions. The transitions without consuming an input symbol are called ∈-transitions. It is used for positive look ahead assertion. The next two columns work hand in hand: the "Example" column gives a valid regular expression that uses the element, and the "Sample Match" column presents a text string that could be matched by the regular expression. Regular Expressions are the easier mechanism to search the data that matches the complex criteria. The next two columns work hand in hand: the "Example" column gives a valid regular expression that uses the element, and the "Sample Match" column presents a text string that could be matched by the regular expression. Learn more, Perl for Beginners: Learn A to Z of Perl Scripting Hands-on. A string of text can be further defined as a single character, word, sentence or particular pattern of characters. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Page Replacement Algorithms in Operating Systems, Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter), Complexity of different operations in Binary tree, Binary Search Tree and AVL tree, Advantages and Disadvantages of Subnetting. any character except newline \w \d \s: word, digit, whitespace It is also known as regexp.When user learns regular expression then there might be a need for quick look of those concepts which he didnt use often. For two as at any positions, it will go from q0 to q1 for 1st a and q1 to q0 for second a. The syntax of regular expressions in Perl is very similar to what you will find within other regular expression.supporting programs, such as sed, grep, and awk. basic syntax of Regular Expression: Example : Perl; JavaScript; Must Learn Expand child menu. A string of text can be further defined as a single character, word, sentence or particular pattern of characters. Let us check out PATINDEX function first. We can easily find use of regular expressions in different kind of software, from simplest to incredibly complex applications. However, its only one of the many places you can find regular expressions. Thank you soooooo much for this site. Allows use of . Regular Expression Flags; i: Ignore case: m ^ and $ match start and end of line: s. matches newline as well: x: Allow spaces and comments: J: Duplicate group names allowed: U: Ungreedy quantifiers (?iLmsux) Set flags within regex: Regular Expression Special Characters \\n: Newline \\r: Carriage return \\t: Tab \\0: Null character The Addedbytes cheat sheet is grossly oversimplified, and has some glaring errors. Create a regular expression to validate pin code of India as mentioned below: regex = "^[1-9]{1}[0-9]{2}\\s{0, 1}[0-9]{3}$"; Where: ^ represents the starting of the number. The above automata will accept all binary numbers divisible by 3. In this SQL query cheat sheet, you will learn data types, SELECT statement, INSERT and DELETE commands, ORDER BY, GROUP BY, and more. I'm using python regex for natural language processing in sentiment analysis and this helped me a lot. For example, we can replace all occurrences of dog with cat using the following regular expression . Matches backspace (0x08) when inside brackets. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Perl Installation and Environment Setup in Windows, Linux, and MacOS, Perl | Decision Making (if, if-else, Nestedif, if-elsif ladder, unless, unless-else, unless-elsif), Perl | Loops (for, foreach, while, dowhile, until, Nested loops), Perl | Arrays (push, pop, shift, unshift), Perl | Quoted, Interpolated and Escaped Strings, Object Oriented Programming (OOPs) in Perl. 2. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. During regex matching, these are used to capture buffers. Matches newlines, carriage returns, tabs, etc. This only works in IE and Netscape 8.1+ in IE rendering engine mode. The valid GUID (Globally Unique Identifier) must specify the following conditions: . Inside regex, these groups are referred by \1 and outside regex these groups are referred by $1. Regex in Perl is linked to the host language and is not the same as in PHP, Python, etc. A MySQL subquery is called an inner query while the query that contains the subquery is called an outer query. Regular Expression: A Regular Expression is an object that describes a pattern of characters. This automaton replaces the transition function with the one that allows the empty string ∈ as a possible input. The syntax of regular expressions in Perl is very similar to what you will find within other regular expression.supporting programs, such as sed, grep, and awk.. When user learns regular expression then there might be a need for quick look of those concepts which he didnt use often. Matches any single character in brackets. Writing code in comment? acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Installing MongoDB on Windows with Python. Using something as simple as a remote style sheet you can include your XSS as the style parameter can be redefined using an embedded expression. But elsewhere it says < and > are metacharacters and must be escaped (to \< and \> ) to match them literally, which not true in any flavor Let us see them one by one by taking some sample scenarios; Step 3: CREATING TABLE Country under GEEKSFORGEEKS and insert few records. ∈-transitions provide a convenient way of modeling the systems whose current states are not precisely known: i.e., if we are modeling a system and it is not clear whether the current state (after processing some input string) should be q or q, then we can add an ∈-transition between these two states, thus putting the automaton in both states simultaneously. It matches only at the end of the string. Given string str, the task is to check whether the given string is valid GUID (Globally Unique Identifier) or not by using Regular Expression. It should be a 128-bit number. Regular Expression to . One character that is both in those on the left and in the && class. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. It includes all the characters from a to j. This only works in IE and Netscape 8.1+ in IE rendering engine mode. There is no official Full form of the Perl, but still, the most used expansion is Practical Extraction and Reporting Language. This chapter describes JavaScript regular expressions. So, in this area JavaScript plays a major role in validating the values. Matches 1 or more occurrence of preceding expression. The Addedbytes cheat sheet is grossly oversimplified, and has some glaring errors. String with regular expression (111 + 11111)* : The string accepted using this regular expression will have 3, 5, 6(111 twice), 8 (11111 once and 111 once), 9 (111 thrice), 10 (11111 twice) and all other counts of 1 afterwards. So here we have provided a regex cheat sheet containing all the different character classes, special characters, modifiers, sets etc. For example, from an alphanumeric value, extract only the alpha value or numeric value or check for the specific patterns of character matching and retrieve the records, etc. By using our site, you Therefore the statement , will set $true to 1 if $foo matches the regex, or 0 if the match fails. There is no official Full form of the Perl, but still, the most used expansion is Practical Extraction and Reporting Language. It matches at the word boundary of the string from \w to \W. The left-hand side of the statement will contain a string which will be matched with the right-hand side containing the specified pattern. The syntax of regular expressions in Perl is very similar to what you will find within other regular expression.supporting programs, such as sed, grep, and awk.. Thank you for your effort. Programs can be written in Perl in any of the widely used text editors like Notepad++, gedit, etc. Regular Expressions are used to perform pattern-matching and search-and-replace functions on text. Please use ide.geeksforgeeks.org, It will move to q1 after reading a and remain in same state for all a afterwards. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. any character except newline \w \d \s: word, digit, whitespace It provides a single engine for DBAs, enterprise architects, and developers to keep critical applications running, store and query anything, and power faster decision making and innovation across your organization. Otherwise, it will be in q1 or q2, hence rejected. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. For example , The | character is just like the standard or bitwise OR within Perl. It is also known as regexp.When user learns regular expression then there might be a need for quick look of those concepts which he didnt use often. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Javascript's engine is close to that and PHP also has Perl Compatible functions for Regex; they use the PREG prefix. Equivalent to [\t\n\r\f]. IBM Db2 is the cloud-native database built to power low latency transactions and real-time analytics at scale. Tough thing about Regex is not learning or understanding it but remembering syntax and how to form pattern according to our requirements. One character that is in those on the left, but not in the subtracted class. Writing code in comment? Most everything on this sheet should be supported by PHP's engine (I think POSIX character classes are not). The valid GUID (Globally Unique Identifier) must specify the following conditions: . All the metacharacters must be escaped. In this SQL query cheat sheet, you will learn data types, SELECT statement, INSERT and DELETE commands, ORDER BY, GROUP BY, and more. Using something as simple as a remote style sheet you can include your XSS as the style parameter can be redefined using an embedded expression. The \B assertion matches any position that is not a word boundary. Recent Articles on Perl! Single or double-quoted string. There is also a simpler version of the match operator - the ?PATTERN? Well done, very useful page. It is used for searching the specified text pattern. The DFA corresponding to given regular expression is given in Figure 5. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. The grouping construct () creates capture groups known as capture buffers. A, PCRE (C, PHP, R): ASCII letters A-Z and a-z, PCRE (C, PHP, R): ASCII digits and letters A-Z and a-z, Ruby 2: Unicode digit, letter or ideogram, PCRE (C, PHP, R): ASCII punctuation mark, Turns all (parentheses) into non-capture groups. string we have been using in this chapter . Matches "Python" at the start of a string or internal line, Matches "Python" at the end of a string or line, Matches "Python" at the start of a string, \B is nonword boundary: match "rub" in "rube" and "ruby" but not alone, Matches "Python", if followed by an exclamation point, Matches "Python", if not followed by an exclamation point, Group only without creating \1 backreference, We make use of First and third party cookies to improve our user experience. For example, it says \< and \> are word boundaries, which is true only (AFAIK) in the Boost regex library. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Character classes. which are used in regular expression. Accounting; Embedded Systems; Similarly, we can use regular expression as the best search pattern practice. Matches whitespace. Regular Expression: A Regular Expression is an object that describes a pattern of characters. This site is absolute gold mine. We can use this functionality of using a regular expression with functions like PATINDEX, we can solve to get only the characters alone from input string/numbers alone from input string etc.. By having PATINDEX and STUFF functions, we can get only the character values from an input string. The /d modifier deletes the characters matching SEARCHLIST that do not have a corresponding entry in REPLACEMENTLIST. @Pattern(regexp = "^[a-zA-Z0-9]{6,12}$", message = "username must be of 6 to 12 length with no special characters") private String username; An non-whitespace character that is a non-digit. An Arabic character that is not a non-digit, i.e., an Arabic digit. Regular Expressions are used to perform pattern-matching and search-and-replace functions on text. Practice Problems, POTD Streak, Weekly Contests & More! Matches nth grouped subexpression if it matched already. For example, the following query uses a subquery to return the employees who work in the offices located in the USA. It is used to match pattern of the branch test. It includes all characters except a and z. 1. An object of this class represents a regular expression, that can be used for string matching purposes. Since Perl is a lot similar to other widely used languages syntactically, it is easier to code and learn in Perl. "Python" followed by one or more ! There are three types of quantifiers. Some of the programmers also refer Perl as the Pathologically Eclectic Rubbish Lister Or Practically The above automata will accept all string which have ab as substring. It should be displayed in five groups separated Thank you! Metacharacters are used to match patterns in Perl regular expressions. It is also known as regexp.When user learns regular expression then there might be a need for quick look of those concepts which he didnt use often. Regular Expression (Regex or Regexp or RE) in Perl is a special text string for describing a search pattern within a given text. To get the records starting between A D and the second letter between U to Z and the rest of the letters can be anything. In Kotlin, the support for regular expression is provided through Regex class. For example, it says \< and \> are word boundaries, which is true only (AFAIK) in the Boost regex library. Please use ide.geeksforgeeks.org, Throughout SQL, we can use a regular expression to extract different outputs to our needs. It can be used with other functions also and it will help to get only alphabets from an input string/numerals from an input string. It is also known as reg-ex pattern. It checks if a occurs 2 to infinite times. For example, to match "cat" or "dog" in an expression, you might use this , You can group individual elements of an expression together in order to support complex matches. It specifies alternate matches within a regular expression or group. For example, it says \< and \> are word boundaries, which is true only (AFAIK) in the Boost regex library. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. \2 matches whatever the 2nd group matched, etc. Common regular expression used in make ∈-NFA: Example: Create a ∈-NFA for regular expression: (a/b)*a, Refer for Conversion from NFA to DFA, Minimization of DFA. It is implied, without doing anything its just how the language works. In the state diagrams, they are usually labeled with the Greek letter ∈. 1. It was developed by Larry Wall, in 1987. For string aaa, it will move from q0 to q1 then q1 to q2 and then q2 to q0. By using this website, you agree with our Cookies Policy. An English lowercase letter that is not a vowel. Perl | Extract IP Address from a String using Regex, Perl - Extracting Date from a String using Regex, Perl | Backtracking in Regular Expression, Perl | Loops (for, foreach, while, dowhile, until, Nested loops), Perl | Removing leading and trailing white spaces (trim), Perl | String functions (length, lc, uc, index, rindex), Complete Interview Preparation- Self Paced Course, Data Structures & Algorithms- Self Paced Course. It is also known as reg-ex pattern. It can be used to search for a string which matches the specified pattern. Matches n or more occurrences of preceding expression. It includes all lowercase characters from a to z. For example, m{}, m(), and m>< are all valid. The attribute regexp takes the regular expression to be matched. Standard Perl ranges can also be used, allowing you to specify ranges of characters either by letter or numerical value. Regular expressions can also be used from the command line and in text editors to It is used for searching the specified text pattern. Regular Expression (Regex or Regexp or RE) in Perl is a special text string for describing a search pattern within a given text. The valid GUID (Globally Unique Identifier) must specify the following conditions: . We can use the regular expression in other functions also. It is also known as reg-ex pattern. Regular Expression Regular expression is a sequence of character(s) mainly used to find and replace patterns in a string or file. Perl is a lot similar to C syntactically and is easy for the users who have knowledge of C, C++. Allows the search to continue even after a global match fails. Regular expressions can also be used from the command line and in text editors to Java, Ruby 2+: character class intersection. Character classes. [1-9]{1} represents the starting digit in the pin code ranging from 1 to 9. For example, you can use this to get the first and last elements within a list , Regular expression variables include $, which contains whatever the last grouping match matched; $&, which contains the entire matched string; $`, which contains everything before the matched string; and $', which contains everything after the matched string. Regular Expression Flags; i: Ignore case: m ^ and $ match start and end of line: s. matches newline as well: x: Allow spaces and comments: J: Duplicate group names allowed: U: Ungreedy quantifiers (?iLmsux) Set flags within regex: Regular Expression Special Characters \\n: Newline \\r: Carriage return \\t: Tab \\0: Null character It is a function that accepts the search pattern and input string and returns the starting position of the character not matching the pattern. Regular Expression Regular expression is a sequence of character(s) mainly used to find and replace patterns in a string or file. For example, when extracting the hours, minutes, and seconds from a time string, we can use , The match operator supports its own set of modifiers. Prerequisite Finite Automata Introduction, Designing Finite Automata from Regular Expression (Set 1) ∈-NFA is similar to the NFA but have minor difference by epsilon move.

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perl regular expression cheat sheet