regexp syntax - luxembourg/muxcode-clm GitHub Wiki

REGEXP SYNTAX (continued)

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.

Related Topics: regexp ambiguity, regexp examples