by pietman
18. May 2010 11:33
Characters
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\a
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Alert, x07.
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\b
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Backspace, x08.
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\e
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ESC, x1B.
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\n
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Newline, x0A.
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\r
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Carriage return, x0D.
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\f
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Form feed, x0C.
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\t
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Tab, x09.
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\v
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Vertical tab, x0B.
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\0octal
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Two-digit octal character code.
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\xhex
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Two-digit hexadecimal character code.
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\uhex
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Four-digit hexadecimal character code.
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\cchar
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Named control character.
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Classes
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[...]
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Single character from the listed range.
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[^...]
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Single character not from the listed range.
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.
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Any single character except for a line terminator (unless in single-line mode - s).
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\w
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Word character such as [a-zA-Z_0-9]
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\W
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Non-word character - basically [^a-zA-Z_0-9]
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\d
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Digit [0-9]
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\D
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Non-digit [^0-9]
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\s
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Whitespace character such as [ \f\n\r\t\v]
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\S
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Non-whitespace character
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\p{prop}
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Character that is contained in the specified Unicode block / property.
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\P{prop}
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Character that is not contained in the specified Unicode block / property.
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Tests etc
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^
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Start of a string, or following a newline in MULTILINE mode.
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\A
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Beginning of string, in all match modes.
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$
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End of string or before any newline if in MULTILINE mode.
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\Z
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End of string but before any final line terminator, in all match modes.
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\z
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End of string in all match modes.
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\b
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Boundary between a \w character and a \W character.
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\B
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Not-word-boundary.
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\G
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End of the previous match.
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(?=...)
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Positive lookahead.
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(?!...)
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Negative lookahead.
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(?<=...)
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Positive lookbehind.
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(?<!...)
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Negative lookbehind.
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mode modifiers
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Singleline
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s
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Dot (.) matches any character, including a line terminator.
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Multiline
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m
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^ and $ match next to embedded line terminators.
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IgnorePatternWhitespace
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x
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Ignore whitespace and allow embedded comments starting with #.
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IgnoreCase
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i
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Case-insensitive match based on characters in the current culture.
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CultureInvariant
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i
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Culture-insensitive match.
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ExplicitCapture
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n
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Allow named capture groups, but treat parentheses as non-capturing groups.
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Compiled
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Compile regular expression.
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RightToLeft
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Search from right to left, starting to the left of the start position.
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ECMAScript
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Enables ECMAScript compliance when used with IgnoreCase or Multiline.
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(?imnsx-imnsx)
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Turn match flags on or off for rest of pattern.
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(?imnsx-imnsx:...)
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Turn match flags on or off for the rest of the subexpression.
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(?#...)
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Treat substring as a comment.
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#...
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Treat rest of line as a comment in /x mode.
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groups and repititions
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(...)
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Grouping. Submatches fill \1,\2,... and $1, $2,....
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\n
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In a regular expression, match what was matched by the nth earlier submatch.
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$n
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In a replacement string, contains the nth earlier submatch.
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(?<name>...)
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Captures matched substring into group, name.
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(?:...)
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Grouping-only parentheses, no capturing.
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(?>...)
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Disallow backtracking for subpattern.
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...|...
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Alternation; match one or the other.
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*
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Repeated 0 or more times.
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+
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Repeated 1 or more times.
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?
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Repeated 1 or 0 times.
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{n}
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Repeated exactly n times.
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{n,}
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Repeated at least n times.
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{x,y}
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Repeated at least x times, but no more than y times.
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*?
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Repeated 0 or more times, but as few times as possible.
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+?
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Repeated 1 or more times, but as few times as possible.
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??
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Repeated 0 or 1 times, but as few times as possible.
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{n,}?
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Repeated at least n times, but as few times as possible.
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{x,y}?
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Repeated at least x times, no more than y times, but as few times as possible.
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Replacements
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$1, $2, ...
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The captured submatches.
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${name}
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The matched text for a named capture group.
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$'
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Text before match.
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$&
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Text of match.
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$'
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Text after match.
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$+
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Last parenthesized match.
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$_
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Original input string.
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