Following regex expression does not work with boost regex

Question

I am doing the following

std::string myregex = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$" boost::regex re; re.assign(regex_expr, boost::regex_constants::icase); //Problem - Breaks

Any suggestions on what might be wrong with the assign statement

What is the error shown?

nhahtdh
– nhahtdh

2014-01-30 04:52:53 +00:00
Commented Jan 30, 2014 at 4:52 — nhahtdh
– nhahtdh, Commented Jan 30, 2014 at 4:52
@nhahtdh It throws an exception.

user1508519
– user1508519

2014-01-30 04:54:29 +00:00
Commented Jan 30, 2014 at 4:54 — user1508519
– user1508519, Commented Jan 30, 2014 at 4:54

nhahtdh · Accepted Answer · 2014-01-30 05:32:49Z

The parser of some regex engines is more nitpicky than the others. However, they generally parse the regex correctly if you put - at the end of a character class.

"^[_A-Za-z0-9+-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$" ^^

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