(gawk.info) Regexp

 
 Regular Expressions
 *******************
 
    A "regular expression", or "regexp", is a way of describing a set of
 strings.  Because regular expressions are such a fundamental part of
 `awk' programming, their format and use deserve a separate chapter.
 
    A regular expression enclosed in slashes (`/') is an `awk' pattern
 that matches every input record whose text belongs to that set.
 
    The simplest regular expression is a sequence of letters, numbers, or
 both.  Such a regexp matches any string that contains that sequence.
 Thus, the regexp `foo' matches any string containing `foo'.  Therefore,
 the pattern `/foo/' matches any input record containing the three
 characters `foo', _anywhere_ in the record.  Other kinds of regexps let
 you specify more complicated classes of strings.

 
* Regexp Usage                How to Use Regular Expressions.
* Escape Sequences            How to write non-printing characters.
* Regexp Operators            Regular Expression Operators.
* GNU Regexp Operators        Operators specific to GNU software.
* Case-sensitivity            How to do case-insensitive matching.
* Leftmost Longest            How much text matches.
* Computed Regexps            Using Dynamic Regexps.

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