Boost regex example download

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XHTML 1. Asked 10 years, 8 months ago. Active 4 years, 9 months ago. Viewed 33k times. Improve this question. Did you try the Boost Regex tutorial and documentation? Got some code so far to share with us?

First try to match a single IP address — snoofkin. That re has bugs: It allows 00 and it does not work with left justified or right justified IP addresses. It is also not syntactically factored for maximum speed. The correct one is at stackoverflow. Add a comment.

Active Oldest Votes. Improve this answer. Vitus Vitus Iterator "end" is not initialized. Is that OK? For example if the library is compiled with the Win32 localization model, then [a-z] will match the ASCII characters a-z, and also 'A', 'B' etc, but not 'Z' which collates just after 'z'. This locale specific behavior is disabled by default in perl mode , and forces ranges to collate according to ASCII character code.

Character classes are denoted using the syntax "[:classname:]" within a set declaration, for example "[[:space:]]" is the set of all whitespace characters. The available character classes are:. Other characters may also be included depending upon the locale. Unicode Any character whose code is greater than , this applies to the wide character traits classes only. Collating elements take the general form [. The library supports all the standard POSIX collating element names, and in addition the following digraphs: "ae", "ch", "ll", "ss", "nj", "dz", "lj", each in lower, upper and title case variations.

Multi-character collating elements can result in the set matching more than one character, for example [[. An equivalence class is a set of characters that collate the same, a primary equivalence class is a set of characters whose primary sort key are all the same for example strings are typically collated by character, then by accent, and then by case; the primary sort key then relates to the character, the secondary to the accentation, and the tertiary to the case.

Unfortunately there is no locale independent method of obtaining the primary sort key for a character, except under Win For other operating systems the library will "guess" the primary sort key from the full sort key obtained from strxfrm , so equivalence classes are probably best considered broken under any operating system other than Win A back reference is a reference to a previous sub-expression that has already been matched, the reference is to what the sub-expression matched, not to the expression itself.

For example the expression ". A back reference to a sub-expression that did not participate in any match, matches the null string: NB this is different to some other regular expression matchers. This is an extension to the algorithm that is not available in other libraries, it consists of the escape character followed by the digit "0" followed by the octal character code.

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