c++ - How to remove punctuation around a string -

i want remove punctuation around string such string:

 !dont't?.

will becomes:

 don't

i have seem able remove punctuation in string with:

int len = str.size(); (int = 0; < len; i++){     if (ispunct(str[i])){         str.erase(i--, 1);         len = str.size();     } }

do guys know simple way rid of punctuation front , only?

yes, can use boost::trim_if (see work):

boost::trim_if(str, boost::is_punct());

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