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Word Operators

The following operators are provided for compatibility with the GNU regular expression library.

• "\w" matches any single character that is a member of the "word" character class, this is identical to the expression "[[:word:]]".
• "\W" matches any single character that is not a member of the "word" character class, this is identical to the expression "[^[:word:]]".
• "\<" matches the null string at the start of a word.
• "\>" matches the null string at the end of the word.
• "\b" matches the null string at either the start or the end of a word.
• "\B" matches a null string within a word.

The start of the sequence passed to the matching algorithms is considered to be a potential start of a word unless the flag match_not_bow is set. The end of the sequence passed to the matching algorithms is considered to be a potential end of a word unless the flag match_not_eow is set.