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Richard M. Stallman 2000-01-03 05:26:02 +00:00
parent 8964fec710
commit c082a34881
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lispref/searching.texi
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@ -264,6 +264,19 @@ is a postfix operator, similar to @samp{*} except that it must match the
preceding expression either once or not at all. For example,
@samp{ca?r} matches @samp{car} or @samp{cr}; nothing else.
@item @samp{*?}, @samp{+?}, @samp{??}
These are ``non-greedy'' variants of the operators @samp{*}, @samp{+}
and @samp{?}. Where those operators match the largest possible
substring (consistent with matching the entire containing expression),
the non-greedy variants match the smallest possible substring
(consistent with matching the entire containing expression).
For example, the regular expression @samp{c[ad]*a} when applied to the
string @samp{cdaaada} matches the whole string; but the regular
expression @samp{c[ad]*?a}, applied to that same string, matches just
@samp{cda}. (The smallest possible match here for @samp{[ad]*?} that
permits the whole expression to match is @samp{d}.)
@item @samp{[ @dots{} ]}
@cindex character alternative (in regexp)
@cindex @samp{[} in regexp