| JavaScript - Anchoring match position | | Print | |
Anchoring match position
An anchor in a regular expression matches a position in a string (such as the beginning or the end of the string) without matching any of the characters of a string. It can be used to restrict (or anchor) a match to a specific position within a string.
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Character |
Meaning |
|---|---|
|
^, $ |
Require match at beginning/end of a string, or in multiline mode, beginning/end of a line |
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\b, \B |
Require match at a word boundary/non-boundary |
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(?=p) |
Look-ahead assertion: require that the following characters match the pattern p, but do not include them in the match. (JS 1.5) |
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(?!p) |
Negative look-ahead assertion: require that the following characters do not match the pattern p. (JS 1.5) |
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