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Bruce Hill 2021-05-20 17:19:46 -07:00
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@ -202,10 +202,20 @@ zero or more comma-separated words)
instances of *skip* (e.g. **\`\"..\`\" % (\`\\.)**)
**\<** *pat*
: Just after *pat* (lookbehind)
: Matches at the current position if *pat* matches immediately before the
current position (lookbehind). Conceptually, you can think of this as creating
a file containing only the *N* characters immediately before the current
position and attempting to match *pat* on that file, for all values of *N* from
the minimum number of characters *pat* can match up to maximum number of
characters *pat* can match (or the length of the current line upto the current
position, whichever is smaller). **Note:** For fixed-length lookbehinds, this
is quite efficient (e.g. **\<(100\`x)**), however this could cause performance
problems with variable-length lookbehinds (e.g. **\<(\`x 0-100\`y)**). Also,
it is not advised to use **\^**, **\^\^**, **$**, or **$$** inside a lookbehind,
as they will match against the edges of the lookbehind slice.
**\>** *pat*
: Just before *pat* (lookahead)
: Matches *pat*, but does not consume any input (lookahead).
**\@** *pat*
: Capture *pat*