GnuPG - RFC2440

# RFC2440

[ Contents ]

    8. Regular Expressions

       A regular expression is zero or more branches, separated by '|'. It
       matches anything that matches one of the branches.

       A branch is zero or more pieces, concatenated. It matches a match for
       the first, followed by a match for the second, etc.

       A piece is an atom possibly followed by '*', '+', or '?'. An atom
       followed by '*' matches a sequence of 0 or more matches of the atom.
       An atom followed by '+' matches a sequence of 1 or more matches of
       the atom. An atom followed by '?' matches a match of the atom, or the
       null string.

       An atom is a regular expression in parentheses (matching a match for
       the regular expression), a range (see below), '.' (matching any
       single character), '^' (matching the null string at the beginning of
       the input string), '$' (matching the null string at the end of the
       input string), a '\' followed by a single character (matching that
       character), or a single character with no other significance
       (matching that character).

       A range is a sequence of characters enclosed in '[]'. It normally
       matches any single character from the sequence. If the sequence
       begins with '^', it matches any single character not from the rest of
       the sequence. If two characters in the sequence are separated by '-',
       this is shorthand for the full list of ASCII characters between them
       (e.g. '[0-9]' matches any decimal digit). To include a literal ']' in
       the sequence, make it the first character (following a possible '^').
       To include a literal '-', make it the first or last character.

HTML conversion and comments on this are RFC are Copyright (c) 1998 Werner Koch, Remscheider Str. 22, 40215 Düsseldorf, Germany. Verbatim copying and distribution is permitted in any medium, provided this notice is preserved. See here for copyright information on the RFC itself.

Updated: 1999-05-23 wkoch