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              Regex 官方文檔

              Anchors

              Anchros

              • ^
              • Start of string, or start of line in multi-line pattern
              • \>
              • End of word
              • \<
              • Start of word
              • \A
              • Start of string
              • \b
              • Word boundary
              • \Z
              • End of string
              • $
              • End of string, or end of line in multi-line pattern

              Quantifiers

              Quantifiers

              Character

              Character Classes

              • \c
              • Control character
              • \d
              • Digit
              • \O
              • Octal digit
              • \s
              • White space
              • \w
              • Word
              • \x
              • Hexade-cimal digit

              Special

              • \f
              • Form feed
              • \n
              • New line
              • \r
              • Carriage return
              • \t
              • Tab
              • \v
              • Vertical tab
              • \xhh
              • Hex character hh
              • \xxx
              • Octal character xxx

              Examples

              Metacharacter

              Sample

              POSIX

              POSIX

              Groups

              Groups and Ranges

              • .
              • Any character except new line (\n)
              • (?:...)
              • Passive (non-c-apt-uring) group
              • (...)
              • Group
              • (a|b)
              • a or b
              • [^abc]
              • Not a or b or c
              • [0-7]
              • Digit from 0 to 7
              • [a-q]
              • Letter from a to q
              • [abc]
              • Range (a or b or c)

              Modifiers

              Modifiers

              • e
              • Evaluate replac-ement
              • g
              • Global match
              • i
              • Case-i-nse-nsitive
              • m
              • Multiple lines
              • s
              • Treat string as single line
              • U
              • Ungreedy pattern
              • x
              • Allow comments and white space in pattern

              String

              Replacement

              • $`
              • Before matched string
              • $'
              • After matched string
              • $&
              • Entire matched string
              • $+
              • Last matched string
              • $1
              • "-xyz-" in /^(?:a-bc)-(xyz)$/
              • $2
              • "-xyz-" in /^(abc-(xy-z))$/
              • $n
              • nth non-pa-ssive group

              Assertions

              Assertions

              • ?!
              • Negative lookahead
              • ?!= or ?<!
              • Negative lookbehind
              • ?()
              • Condition [if then]
              • ?()|
              • Condition [if then else]
              • ?>
              • Once-only Subexp-ression
              • ?<=
              • Lookbehind assertion
              • ?#
              • Comment
              • ?=
              • Lookahead assertion
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