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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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