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      2. 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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