(sed.info.gz) Extended regexps

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 Extended regular expressions
 ****************************
 
    The only difference between basic and extended regular expressions
 is in the behavior of a few characters: `?', `+', parentheses, and
 braces (`{}').  While basic regular expressions require these to be
 escaped if you want them to behave as special characters, when using
 extended regular expressions you must escape them if you want them _to
 match a literal character_.
 
 Examples:
 `abc?'
      becomes `abc\?' when using extended regular expressions.  It
      matches the literal string `abc?'.
 
 `c\+'
      becomes `c+' when using extended regular expressions.  It matches
      one or more `c's.
 
 `a\{3,\}'
      becomes `a{3,}' when using extended regular expressions.  It
      matches three or more `a's.
 
 `\(abc\)\{2,3\}'
      becomes `(abc){2,3}' when using extended regular expressions.  It
      matches either `abcabc' or `abcabcabc'.
 
 `\(abc*\)\1'
      becomes `(abc*)\1' when using extended regular expressions.
      Backreferences must still be escaped when using extended regular
      expressions.
 

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