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and also as an argument of the following functions
where they are used for searching in and testing character strings. The classes
permit object-oriented use of regular expressions.
A regular expression r is made up of literal characters and special characters in accordance with the syntax of regular expressions and represents a set of character strings. If text is a character string represented by r, this indicates that r matches text or that r fits text. Two (different) regular expressions match if they fit the same set of character strings.
If a regular expression is applied to a character string text as a search string, this indicates that a search for matches of the regular expression with substrings of text is intended. In this case, special characters in the regular expression do not match characters, but instead match positions, thus influencing the type and number of occurrences. When character strings are tested, this involves checking whether the full content matches a pattern.
This software uses the Boost.Regex Library. Copyright (c) 1998-2013 Dr. John Maddock.