Regex stands for the regular expression, and it is a technique to search string patterns from a string. It is used by many text editors such as Sublime, Notepad, Brackets, Microsoft word, etc for search and replaces operations. Regular Expression Cheat Sheet. For more information, see “JavaScript for impatient programmers”: lookahead assertions, lookbehind assertions. A word of caution about regular expressions # Regular expressions are a double-edged sword: powerful and short, but also sloppy and cryptic.
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-->A regular expression is a pattern that the regular expression engine attempts to match in input text. A pattern consists of one or more character literals, operators, or constructs. For a brief introduction, see .NET Regular Expressions.
Each section in this quick reference lists a particular category of characters, operators, and constructs that you can use to define regular expressions.
We've also provided this information in two formats that you can download and print for easy reference:
Character Escapes
The backslash character () in a regular expression indicates that the character that follows it either is a special character (as shown in the following table), or should be interpreted literally. For more information, see Character Escapes.
| Escaped character | Description | Pattern | Matches |
|---|---|---|---|
a | Matches a bell character, u0007. | a | 'u0007' in 'Error!' + 'u0007' |
b | In a character class, matches a backspace, u0008. | [b]{3,} | 'bbbb' in 'bbbb' |
t | Matches a tab, u0009. | (w+)t | 'item1t', 'item2t' in 'item1titem2t' |
r | Matches a carriage return, u000D. (r is not equivalent to the newline character, n.) | rn(w+) | 'rnThese' in 'rnThese arentwo lines.' |
v | Matches a vertical tab, u000B. | [v]{2,} | 'vvv' in 'vvv' |
f | Matches a form feed, u000C. | [f]{2,} | 'fff' in 'fff' |
n | Matches a new line, u000A. | rn(w+) | 'rnThese' in 'rnThese arentwo lines.' |
e | Matches an escape, u001B. | e | 'x001B' in 'x001B' |
| Uses octal representation to specify a character (nnn consists of two or three digits). | w040w | 'a b', 'c d' in 'a bc d' |
xnn | Uses hexadecimal representation to specify a character (nn consists of exactly two digits). | wx20w | 'a b', 'c d' in 'a bc d' |
cXcx | Matches the ASCII control character that is specified by X or x, where X or x is the letter of the control character. | cC | 'x0003' in 'x0003' (Ctrl-C) |
unnnn | Matches a Unicode character by using hexadecimal representation (exactly four digits, as represented by nnnn). | wu0020w | 'a b', 'c d' in 'a bc d' |
| When followed by a character that is not recognized as an escaped character in this and other tables in this topic, matches that character. For example, * is the same as x2A, and . is the same as x2E. This allows the regular expression engine to disambiguate language elements (such as * or ?) and character literals (represented by * or ?). | d+[+-x*]d+ | '2+2' and '3*9' in '(2+2) * 3*9' |
Character Classes
A character class matches any one of a set of characters. Character classes include the language elements listed in the following table. For more information, see Character Classes.
| Character class | Description | Pattern | Matches |
|---|---|---|---|
[character_group] | Matches any single character in character_group. By default, the match is case-sensitive. | [ae] | 'a' in 'gray''a', 'e' in 'lane' |
[^character_group] | Negation: Matches any single character that is not in character_group. By default, characters in character_group are case-sensitive. | [^aei] | 'r', 'g', 'n' in 'reign' |
[first-last] | Character range: Matches any single character in the range from first to last. | [A-Z] | 'A', 'B' in 'AB123' |
. | Wildcard: Matches any single character except n. To match a literal period character (. or u002E), you must precede it with the escape character (.). | a.e | 'ave' in 'nave''ate' in 'water' |
p{name} | Matches any single character in the Unicode general category or named block specified by name. | p{Lu}p{IsCyrillic} | 'C', 'L' in 'City Lights''Д', 'Ж' in 'ДЖem' |
P{name} | Matches any single character that is not in the Unicode general category or named block specified by name. | P{Lu}P{IsCyrillic} | 'i', 't', 'y' in 'City''e', 'm' in 'ДЖem' |
w | Matches any word character. | w | 'I', 'D', 'A', '1', '3' in 'ID A1.3' |
W | Matches any non-word character. | W | ' ', '.' in 'ID A1.3' |
s | Matches any white-space character. | ws | 'D ' in 'ID A1.3' |
S | Matches any non-white-space character. | sS | ' _' in 'int __ctr' |
d | Matches any decimal digit. | d | '4' in '4 = IV' |
D | Matches any character other than a decimal digit. | D | ' ', '=', ' ', 'I', 'V' in '4 = IV' |
Anchors
Anchors, or atomic zero-width assertions, cause a match to succeed or fail depending on the current position in the string, but they do not cause the engine to advance through the string or consume characters. The metacharacters listed in the following table are anchors. For more information, see Anchors.
| Assertion | Description | Pattern | Matches |
|---|---|---|---|
^ | By default, the match must start at the beginning of the string; in multiline mode, it must start at the beginning of the line. | ^d{3} | '901' in '901-333-' |
$ | By default, the match must occur at the end of the string or before n at the end of the string; in multiline mode, it must occur before the end of the line or before n at the end of the line. | -d{3}$ | '-333' in '-901-333' |
A | The match must occur at the start of the string. | Ad{3} | '901' in '901-333-' |
Z | The match must occur at the end of the string or before n at the end of the string. | -d{3}Z | '-333' in '-901-333' |
z | The match must occur at the end of the string. | -d{3}z | '-333' in '-901-333' |
G | The match must occur at the point where the previous match ended. | G(d) | '(1)', '(3)', '(5)' in '(1)(3)(5)[7](9)' |
b | The match must occur on a boundary between a w (alphanumeric) and a W (nonalphanumeric) character. | bw+sw+b | 'them theme', 'them them' in 'them theme them them' |
B | The match must not occur on a b boundary. | Bendw*b | 'ends', 'ender' in 'end sends endure lender' |
Grouping Constructs
Mini vga for mac. Grouping constructs delineate subexpressions of a regular expression and typically capture substrings of an input string. Grouping constructs include the language elements listed in the following table. For more information, see Grouping Constructs.
| Grouping construct | Description | Pattern | Matches |
|---|---|---|---|
(subexpression) | Captures the matched subexpression and assigns it a one-based ordinal number. | (w)1 | 'ee' in 'deep' |
(?<name>subexpression)or (?'name'subexpression) | Captures the matched subexpression into a named group. | (?<double>w)k<double> | 'ee' in 'deep' |
(?<name1-name2>subexpression)or (?'name1-name2'subexpression) | Defines a balancing group definition. For more information, see the 'Balancing Group Definition' section in Grouping Constructs. | (((?'Open'()[^()]*)+((?'Close-Open'))[^()]*)+)*(?(Open)(?!))$ | '((1-3)*(3-1))' in '3+2^((1-3)*(3-1))' |
(?:subexpression) | Defines a noncapturing group. | Write(?:Line)? | 'WriteLine' in 'Console.WriteLine()''Write' in 'Console.Write(value)' |
(?imnsx-imnsx:subexpression) | Applies or disables the specified options within subexpression. For more information, see Regular Expression Options. | Ad{2}(?i:w+)b | 'A12xl', 'A12XL' in 'A12xl A12XL a12xl' |
(?=subexpression) | Zero-width positive lookahead assertion. | bw+b(?=.+and.+) | 'cats', 'dogs'in 'cats, dogs and some mice.' |
(?!subexpression) | Zero-width negative lookahead assertion. | bw+b(?!.+and.+) | 'and', 'some', 'mice'in 'cats, dogs and some mice.' |
(?<=subexpression) | Zero-width positive lookbehind assertion. | bw+b(?<=.+and.+)——————————— bw+b(?<=.+and.*) | 'some', 'mice'in 'cats, dogs and some mice.'———————————— 'and', 'some', 'mice'in 'cats, dogs and some mice.' |
(?<!subexpression) | Zero-width negative lookbehind assertion. | bw+b(?<!.+and.+)——————————— bw+b(?<!.+and.*) | 'cats', 'dogs', 'and'in 'cats, dogs and some mice.'———————————— 'cats', 'dogs'in 'cats, dogs and some mice.' |
(?>subexpression) | Atomic group. | (?>a|ab)c | 'ac' in'ac'nothing in 'abc' |
Lookarounds at a glance
When the regular expression engine hits a lookaround expression, it takes a substring reaching from the current position to the start (lookbehind) or end (lookahead) of the original string, and then runsRegex.IsMatch on that substring using the lookaround pattern. Success of this subexpression's result is then determined by whether it's a positive or negative assertion.
| Lookaround | Name | Function |
|---|---|---|
(?=check) | Positive Lookahead | Asserts that what immediately follows the current position in the string is 'check' |
(?<=check) | Positive Lookbehind | Asserts that what immediately precedes the current position in the string is 'check' |
(?!check) | Negative Lookahead | Asserts that what immediately follows the current position in the string is not 'check' |
(?<!check) | Negative Lookbehind | Asserts that what immediately precedes the current position in the string is not 'check' |
Once they have matched, atomic groups won't be re-evaluated again, even when the remainder of the pattern fails due to the match. This can significantly improve performance when quantifiers occur within the atomic group or the remainder of the pattern.
Quantifiers
A quantifier specifies how many instances of the previous element (which can be a character, a group, or a character class) must be present in the input string for a match to occur. Quantifiers include the language elements listed in the following table. For more information, see Quantifiers.
| Quantifier | Description | Pattern | Matches |
|---|---|---|---|
* | Matches the previous element zero or more times. | d*.d | '.0', '19.9', '219.9' |
+ | Matches the previous element one or more times. | 'be+' | 'bee' in 'been', 'be' in 'bent' |
? | Matches the previous element zero or one time. | 'rai?n' | 'ran', 'rain' |
{n} | Matches the previous element exactly n times. | ',d{3}' | ',043' in '1,043.6', ',876', ',543', and ',210' in '9,876,543,210' |
{n,} | Matches the previous element at least n times. | 'd{2,}' | '166', '29', '1930' |
{n,m} | Matches the previous element at least n times, but no more than m times. | 'd{3,5}' | '166', '17668''19302' in '193024' |
*? | Matches the previous element zero or more times, but as few times as possible. | d*?.d | '.0', '19.9', '219.9' |
+? | Matches the previous element one or more times, but as few times as possible. | 'be+?' | 'be' in 'been', 'be' in 'bent' |
?? | Matches the previous element zero or one time, but as few times as possible. | 'rai??n' | 'ran', 'rain' |
{n}? | Matches the preceding element exactly n times. | ',d{3}?' | ',043' in '1,043.6', ',876', ',543', and ',210' in '9,876,543,210' |
{n,}? | Matches the previous element at least n times, but as few times as possible. | 'd{2,}?' | '166', '29', '1930' |
{n,m}? | Matches the previous element between n and m times, but as few times as possible. | 'd{3,5}?' | '166', '17668''193', '024' in '193024' |
Backreference Constructs
A backreference allows a previously matched subexpression to be identified subsequently in the same regular expression. The following table lists the backreference constructs supported by regular expressions in .NET. For more information, see Backreference Constructs.
| Backreference construct | Description | Pattern | Matches |
|---|---|---|---|
| Backreference. Matches the value of a numbered subexpression. | (w)1 | 'ee' in 'seek' |
k<name> | Named backreference. Matches the value of a named expression. | (?<char>w)k<char> | 'ee' in 'seek' |
Alternation Constructs
Alternation constructs modify a regular expression to enable either/or matching. These constructs include the language elements listed in the following table. For more information, see Alternation Constructs.
| Alternation construct | Description | Pattern | Matches |
|---|---|---|---|
| | Matches any one element separated by the vertical bar (|) character. | th(e|is|at) | 'the', 'this' in 'this is the day.' |
(?(expression)yes|no) | Matches yes if the regular expression pattern designated by expression matches; otherwise, matches the optional no part. expression is interpreted as a zero-width assertion. | (?(A)Ad{2}b|bd{3}b) | 'A10', '910' in 'A10 C103 910' |
(?(name)yes|no) | Matches yes if name, a named or numbered capturing group, has a match; otherwise, matches the optional no. | (?<quoted>')?(?(quoted).+?'|S+s) | 'Dogs.jpg ', 'Yiska playing.jpg' in 'Dogs.jpg 'Yiska playing.jpg' |
Substitutions
Substitutions are regular expression language elements that are supported in replacement patterns. For more information, see Substitutions. The metacharacters listed in the following table are atomic zero-width assertions.
| Character | Description | Pattern | Replacement pattern | Input string | Result string |
|---|---|---|---|---|---|
$number | Substitutes the substring matched by group number. | b(w+)(s)(w+)b | $3$2$1 | 'one two' | 'two one' |
${name} | Substitutes the substring matched by the named group name. | b(?<word1>w+)(s)(?<word2>w+)b | ${word2} ${word1} | 'one two' | 'two one' |
$$ | Substitutes a literal '$'. | b(d+)s?USD | $$$1 | '103 USD' | '$103' |
$& | Substitutes a copy of the whole match. | $?d*.?d+ | **$&** | '$1.30' | '**$1.30**' |
$` | Substitutes all the text of the input string before the match. | B+ | $` | 'AABBCC' | 'AAAACC' |
$' | Substitutes all the text of the input string after the match. | B+ | $' | 'AABBCC' | 'AACCCC' |
$+ | Substitutes the last group that was captured. | B+(C+) | $+ | 'AABBCCDD' | 'AACCDD' |
$_ | Substitutes the entire input string. | B+ | $_ | 'AABBCC' | 'AAAABBCCCC' |
Regular Expression Options
You can specify options that control how the regular expression engine interprets a regular expression pattern. Many of these options can be specified either inline (in the regular expression pattern) or as one or more RegexOptions constants. This quick reference lists only inline options. For more information about inline and RegexOptions options, see the article Regular Expression Options.
You can specify an inline option in two ways:
- By using the miscellaneous construct
(?imnsx-imnsx), where a minus sign (-) before an option or set of options turns those options off. For example,(?i-mn)turns case-insensitive matching (i) on, turns multiline mode (m) off, and turns unnamed group captures (n) off. The option applies to the regular expression pattern from the point at which the option is defined, and is effective either to the end of the pattern or to the point where another construct reverses the option. - By using the grouping construct
(?imnsx-imnsx:subexpression), which defines options for the specified group only.
The .NET regular expression engine supports the following inline options:
| Option | Description | Pattern | Matches |
|---|---|---|---|
i | Use case-insensitive matching. | b(?i)a(?-i)aw+b | 'aardvark', 'aaaAuto' in 'aardvark AAAuto aaaAuto Adam breakfast' |
m | Use multiline mode. ^ and $ match the beginning and end of a line, instead of the beginning and end of a string. | For an example, see the 'Multiline Mode' section in Regular Expression Options. | |
n | Do not capture unnamed groups. | For an example, see the 'Explicit Captures Only' section in Regular Expression Options. | |
s | Use single-line mode. | For an example, see the 'Single-line Mode' section in Regular Expression Options. | |
x | Ignore unescaped white space in the regular expression pattern. | b(?x) d+ s w+ | '1 aardvark', '2 cats' in '1 aardvark 2 cats IV centurions' |
Miscellaneous Constructs
Miscellaneous constructs either modify a regular expression pattern or provide information about it. The following table lists the miscellaneous constructs supported by .NET. For more information, see Miscellaneous Constructs.
| Construct | Definition | Example |
|---|---|---|
(?imnsx-imnsx) | Sets or disables options such as case insensitivity in the middle of a pattern.For more information, see Regular Expression Options. | bA(?i)bw+b matches 'ABA', 'Able' in 'ABA Able Act' |
(?#comment) | Inline comment. The comment ends at the first closing parenthesis. | bA(?#Matches words starting with A)w+b |
# [to end of line] | X-mode comment. The comment starts at an unescaped # and continues to the end of the line. | (?x)bAw+b#Matches words starting with A |
See also
The tables below are a reference to basic regex. While reading the rest of the site, when in doubt, you can always come back and look here. (It you want a bookmark, here's a direct link to the regex reference tables).I encourage you to print the tables so you have a cheat sheet on your desk for quick reference This page provides an overall cheat sheet of all the capabilities of RegExp syntax by aggregating the content of the articles in the RegExp guide. If you need more information on a specific topic, please follow the link on the corresponding heading to access the full article or head to the guide
Java Regex Cheat Sheet # java # regex # codenewbie # beginners. Juneau Lim May 12, 2019 Updated on Jun 04, 2019 ・3 min read. This post will be more of a note for myself. I didn't mean to write a post, but couldn't find a comprehensive one I wanted. So, this post will be not a well-polished one, and, I am not going to say anything about expression in general since there are millions of great. Regular expressions (regex or regexp) are extremely useful in extracting information from any text by searching for one or more matches of a specific search pattern (i.e. a specific sequence of. Do you have any issue with us distributing the PDF regex cheat sheet as is with no changes to others. Before I put it on our internal collaboration tool I need to make sure there are no issues from you in doing so. I will not be modifying the PDF or removing your details from the sheet, it will be just as it is but shareable from within our company's portal As the name suggests, the cheat sheet is for those who regularly code in C++ language and all of the sudden have switched to Java. It explains the concept of Java by comparing it with the concepts of C++. Moreover, it also shows what Java has that C++ don't and vice versa. 6
Java Programming Cheatsheet. We summarize the most commonly used Java language features and APIs in the textbook. Hello, World. Editing, compiling, and executing. Built-in data types. Declaration and assignment statements. Integers. Floating-point numbers. Booleans. Comparison operators. Printing. Parsing command-line arguments. Math library As fge pointed out, regex implementations in most languages (including Java's) are somewhat more powerful than standard regular expressions, and can probably solve this. - user684934 Jan 2 '13 at 10:3 Regex Cheat Sheet. Probably the Best Regular Expression Cheat Sheet on the Net. The most commonly used metacharacters in Python, PHP, Perl, JavaScript, and Ruby. Download as PDF. Metacharacter Meaning n: Newline [] Range or character class [^] Not in range or negated character class. (dot or point) Any character except newline w: Word character [a-zA-Z0-9_] W: Nonword character [^a-zA. . Log In; Search this website. Blog > Community > Regex Cheat Sheet (Regular Expressions) Regex Cheat Sheet (Regular Expressions) Last Updated on September 14, 2020 by RapidAPI Staff Leave a Comment. Regular Expression or regex is a text string that permits developers to build a pattern that can help them match, manage, and locate text. Regex; Linux; HTML; HTML-DOM; mod_rewrite; Even More » OverAPI.com. Python; jQuery; NodeJS; PHP; Java; Ruby; Javascript; ActionScript; CSS; Express; More » Loading.. Anchors. Anchros ^ Start of string, or start of line in multi-line pattern A; Start of string $ End of string, or end of line in multi-line pattern Z; End of string b; Word boundary B; Not word boundary < Start of word.
Regex Cheat Sheet
- MDN documentation for JavaScript regular expressions /pat/ a RegExp object: const pet = /dog/ save regexp in a variable for reuse, clarity, etc /pat/.test(s) Check if given pattern is present anywhere in input string: returns true or false: i: flag to ignore case when matching alphabets: g: flag to match all occurrences: new RegExp('pat', 'i'
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Are you a Java programmer looking for a quick guide on Java Concepts?If yes, then you must take Strings into your consideration. This Java String cheat sheet is designed for the Java aspirants who have already embarked on their journey to learn Java. So, let's quickly get started with this Java String Cheat Sheet Welcome to the Groovy cheat sheet! This is a condensed reference for Groovy syntax and other information that you might regularly want to look up. 1. Core types and operators. Groovy comes with a selection of the basic types you'd expect, such as strings and numbers. Most of them are part of the standard Java class library, although Groovy introduces some new literals. 1.1. Type list. Table. Regular Expression to Regular expression for valid Java variable names, Does not exclude Java reserved word You can consult the regex cheat sheet at the bottom of the page to verify which regex tokens you can use to achieve your desired outcome. RegexPal - This tool also allows you to input your regex expression along with a test string to see if you receive the results you expect. RegexPal also provides you with a larger list of regex examples as well as a regex cheat sheet for reference. If you're.
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- A regular expression, or just regex, is used to match patterns within the given string. Bellow is the cheat sheet of string matching I find useful. Enjoy! Testing Methods. Method test; Executes a search for a match within a given string. Returns true or false /string/.test(My string); // outputs true Method matc
- But regular expr e ssions, at first glance, are unglamorous. One can be afraid of them, but wrongly so. With a few exceptions, they are used in the same way across all platforms. So I'm going to expose the essentials to know about regex with Python. I have prepared you a cheat sheet you can download to sum up what will be seen in this post
- In Regular expressions, fixed quantifiers are denoted by curly braces {}. It contains either the exact quantity or the quantity range of characters to be matched. For example, the regular expression roa{3}r will match the text roaaar, while the regular expression roa{3,6}r will match roaaar, roaaaar, roaaaaar, or roaaaaaar
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- Java Regular Expression Tutorial - Java Regex Groups « Previous; Next » We can group multiple characters as a unit by parentheses. For example, (ab). Each group in a regular expression has a group number, which starts at 1. Method groupCount() from Matcher class returns the number of groups in the pattern associated with the Matcher instance. The group 0 refers to the entire regular.
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