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[DOC] Mention the conditional regexp

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This commit is contained in:
Nobuyoshi Nakada 2023-01-11 21:56:42 +09:00
parent ac8cf010bc
commit a468213917
Notes: git 2023-01-11 14:25:48 +00:00 
Merged: https://github.com/ruby/ruby/pull/7103
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doc/regexp.rdoc
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@ -405,6 +405,15 @@ a single one that matches any of the expressions. Each expression is an
/\w(and|or)\w/.match("furandi") #=> #<MatchData "randi" 1:"and">
/\w(and|or)\w/.match("dissemblance") #=> nil
== Condition
The <tt>(?(</tt><i>cond</><tt>)</tt><i>yes</i><tt>|</tt><i>no</i><tt>)</tt>
syntax matches _yes_ part if _cond_ is captured, otherwise matches _no_ part.
In the case _no_ part is empty, also <tt>|</tt> can be omitted.
The _cond_ may be a backreference number or a captured name. A backreference
number is an absolute position, but can not be a relative position.
== Character Properties
The <tt>\p{}</tt> construct matches characters with the named property,