Error in c++ with regular expression

Question

When I try to make this pattern in c++ the compiler gives me a runtime error

regex IntegerWSign("^((-)|(\+))[0-9]{1,}$");

Remember, in string literals all `'\'` characters need to be escaped. — NathanOliver, May 10 '18 at 15:35

score 0 · Accepted Answer · answered May 10 '18 at 15:37

0

\+ is the valid notation in a regular expression, but inside a C++ string that needs to be \\+.

Your expression was being interpreted as:

^((-)|(+))[0-9]{1,}$

Where that's not valid.

answered May 10 '18 at 15:37

tadman

thank you for explanation it works – momo_hoho May 10 '18 at 15:43
3

Or you could just use a [raw string literal](http://en.cppreference.com/w/cpp/language/string_literal).. – Jesper Juhl May 10 '18 at 15:54

1 Answers1