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.
– Niklas B., Commented Jan 2, 2012 at 16:37
You really need a good introductory C++ book. You have the solution to your own problem in the code you posted. — R. Martinho Fernandes
– R. Martinho Fernandes, Commented Jan 2, 2012 at 16:38

juergen d · Accepted Answer · 2012-01-02 16:39:47Z

3

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

answered Jan 2, 2012 at 16:39

juergen d

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2 Comments

CodersSC Over a year ago

I should have thought about this earlier, ok thanks for your help man

CodersSC Over a year ago

i don't see the check symbol unless im overlooking it :/

R. Martinho Fernandes · Accepted Answer · 2012-01-02 16:45:17Z

3

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

answered Jan 2, 2012 at 16:45

R. Martinho Fernandes

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