as well as an argument of the following functions
for searching 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
we say that
text or that
text. Two (different) regular expressions match if they fit the same set of character strings.
If you apply a regular expression to a character string
text as a search
string, then you are searching for matches of the regular expression with substrings of
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 you
test character strings, you are checking whether the full content matches a pattern.
- A regular expression can be syntactically correct, but too complex for execution, which then raises a handleable exception of the CX_SY_REGEX_TOO_COMPLEX class. Refer to Exceptions in Regular Expressions.
- The example program DEMO_REGEX and its enhancement DEMO_REGEX_TOY enable you to test the search and replace functions by using regular expressions on texts.
This software uses the Boost.Regex Library. Copyright (c) 1998-2004 Dr. John Maddock.