Regular Expressions Reference - Basic Syntax - The Diigo Meta page

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  The regular expressions reference on this website functions both as a reference to all available regex syntax and as a comparison of the features supported by the regular expression flavors discussed in the tutorial.

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  • The regular expressions reference on this website functions both as a reference to all available regex syntax and as a comparison of the features supported by the regular expression flavors discussed in the tutorial.
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  • Any character except [\^$.|?*+()
  • { and }
  • A backslash escapes special characters
  • \ (backslash)
  • Matches the characters between \Q and \E literally
  • \Q...\E
  • Matches the character with the specified ASCII/ANSI value
  • hexadecimal
  • Any character except ^-]\
  • A backslash escapes special characters
  • Negates the character class
  • digits
  • \d, \w and \s
  • (spaces, tabs, and line breaks)
  • (letters, digits, and underscores)
  • Negated versions of the above.
  • [\b] Inside a character class, \b is a backspace character.
  • Matches at the start of the string the regex pattern is applied to. Matches a position rather than a character.
  • Matches at the end of the string the regex pattern is applied to. Matches a position rather than a character
  • Also matches before the very last line break if the string ends with a line break.
  • Matches a position rather than a character. Never matches after line breaks.
  • Matches a position rather than a character. Never matches before line breaks, except for the very last line break if the string ends with a line break.
  • Never matches before line breaks.
  • Matches at the position between a word character
  • and a non-word character
  • Makes the preceding item optional. Greedy
  • Makes the preceding item optional. Lazy
  • Repeats the previous item zero or more times. Greedy
  • Repeats the previous item zero or more times. Lazy
  • Repeats the previous item once or more. Greedy
  • Repeats the previous item once or more. Lazy
  • Repeats the previous item exactly n times.
  • Repeats the previous item between n and m times. Greedy
  • Repeats the previous item between n and m times. Lazy
  • Repeats the previous item at least n times. Greedy
  • Repeats the previous item n or more times. Lazy

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  • ers except the listed special characters match a single instance of themselves. { and } are literal characters, unless they're part of a valid regular expression token (e.g. the {n} quantifier). a matches a\ (backslash) followed by any of [\^$.|?*+(){} A backslash escapes special characters to s
  • s except the listed special characters match a single instance of themselves. { and } are literal characters, unless they're part of a valid regular expression token (e.g. the {n} quantifier). a matches a\ (backslash) followed by any of [\^$.|?*+(){} A backslash escapes special characters to sup
  • oken (e.g. the {n} quantifier).
  • nstance of themselves. { and } are literal characters, unless they're part of a valid r

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  • Negates the character class, causing it to match a single character not listed in the character class. (Specifies a caret if placed anywhere except after the opening [)
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Page Comments

• 
  Richard on 2006-08-07
  Regular Expression Basic Syntax Reference
• 
  Daniel Petersen on 2007-01-31
  Great reference for Regular Expressions

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