how to string match regex in c++

Question

how can I check if the string is matched with an expression using regex c++ (its for robots.txt parser)

eg:

string will be an url
http://www.google.com/example/e/se/in

/*/e/*

means i need to match with the url if it is present or not ....normal query like /example/ can be matched using substring but ..how can i parse some thing similar to this

What have you tried so far? Have you taken a look at any existing C++ regex libraries, e.g. Boost (boost.org/doc/libs/1_46_0/libs/regex)? — Oliver Charlesworth
– Oliver Charlesworth, Commented Feb 22, 2011 at 21:45
i tried this ` boost::regex reg("/*/a/*"); bool b1 = boost::regex_search("google.com/asd/a/asd", reg);` but it matches google.com/asd/aa/asd also — newb
– newb, Commented Feb 22, 2011 at 22:09
You seem to be confusing shell globs with regular expressions. * means "match zero or more of the preceding", not "match any string" like it does with globs. Change * to .* in both instances. — Adam Rosenfield
– Adam Rosenfield, Commented Feb 22, 2011 at 22:34

Adam Rosenfield · Accepted Answer · 2011-02-22 22:14:54Z

3

Regexes have no language support in the current C++ standard. You'll have to use a 3rd-party library such as Boost.Regex or PCRE.

The upcoming C++0x language standard does provide regexes in the <regex> header file, but the standard has not been finalized, and compiler support for the draft standard is limited. Unless you're already developing code for the C++0x draft, I'd advise against this option to ensure that your code is portable.

edited Feb 22, 2011 at 22:14

answered Feb 22, 2011 at 22:07

Adam Rosenfield

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1 Comment

Zooba Over a year ago

This is incorrect with C++0x. <regex> has been implemented fully in VC++ 2010 and partially in GCC.

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