Storing regular expressions within a variable (std::string)

Question

I am trying to store a regular expression within a variable, i.e if we had a regular expression, \\d and a string, std::string str; then I would store the regular expression \\d within std::string str. From that I could then use str whenever I wanted to use that regular expression.

I tried something like this:

Boost::regex const string_matcher("\\d");
std::string str = string_matcher;

However I realized that it would not work. Does anyone have any ides of how I can store a regular expression?

Sorry, I don't get the question. What's wrong with `std::string str = "\\d"; Boost::regex string_matcher(str);` — Niklas B., Jan 02 '12 at 16:37
You really need [a good introductory C++ book](http://stackoverflow.com/q/388242/46642). *You have the solution to your own problem in the code you posted*. — R. Martinho Fernandes, Jan 02 '12 at 16:38

score 3 · Accepted Answer · answered Jan 02 '12 at 16:39

3

std::string regex = "\\d";
boost::regex expression(regex);
bool ok = boost::regex_match(testStr, expression);

answered Jan 02 '12 at 16:39

juergen d

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I should have thought about this earlier, ok thanks for your help man – CodersSC Jan 02 '12 at 17:06
i don't see the check symbol unless im overlooking it :/ – CodersSC Jan 07 '12 at 15:24

score 3 · Answer 2 · answered Jan 02 '12 at 16:45

3

You already have your regular expression stored in a variable. You called it string_matcher.

answered Jan 02 '12 at 16:45

R. Martinho Fernandes

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Storing regular expressions within a variable (std::string)

2 Answers2