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[DOC] [Bug #17120] Fix match-reset \K

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Nobuyoshi Nakada 2022-09-05 18:21:29 +09:00
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doc/regexp.rdoc
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@ -550,12 +550,16 @@ characters, <i>anchoring</i> the match to a specific position.
* <tt>(?<!</tt><i>pat</i><tt>)</tt> - <i>Negative lookbehind</i> * <tt>(?<!</tt><i>pat</i><tt>)</tt> - <i>Negative lookbehind</i>
assertion: ensures that the preceding characters do not match assertion: ensures that the preceding characters do not match
<i>pat</i>, but doesn't include those characters in the matched text <i>pat</i>, but doesn't include those characters in the matched text
* <tt>\K</tt> - Uses an positive lookbehind of the content preceding
<tt>\K</tt> in the regexp. For example, the following two regexps are
almost equivalent:
/ab\Kc/ * <tt>\K</tt> - <i>Match reset</i>: the matched content preceding
/(?<=ab)c/ <tt>\K</tt> in the regexp is excluded from the result. For example,
the following two regexps are almost equivalent:
/ab\Kc/ =~ "abc" #=> 0
/(?<=ab)c/ =~ "abc" #=> 2
These match same string and <i>$&</i> equals <tt>"c"</tt>, while the
matched position is different.
As are the following two regexps: As are the following two regexps: