CODEWITHSUNDEEP
c++regexqt
Ferenc Deak
Ferenc Deak

Reputation: 35398

QRegexp for (??)

I'm fighting for some time to create a QRegExp for matching the string (??) (ie: an opening parantheses, two question marks and a closing parantheses and this should be a separate word, so before and after this can be spaces, tab, newline), The closest I came up with is QRegExp("\\b\\(\\?\\?\\)\\b"); but even this is not matching it... Can you help me with this?

Thanks f.

Upvotes: 0

Views: 512

Answers (2)

Tim Pietzcker
Tim Pietzcker

Reputation: 336078

I don't know QRegexp, but \b only matches between alphanumeric and non-alphanumeric characters, so your regex would match (??) only if it was directly surrounded by alnums (like abc(??)123).

So you need a different approach. Hoping QRegexp supports lookaround, you could use

QRegExp("(?<=\\s|^)\\(\\?\\?\\)(?=\\s|$)");

so the regex checks if there is whitespace or start/end of string before/after (??).

If that doesn't work, you'll have to match the whitespace explicitly:

QRegExp("(?:\\s|^)\\(\\?\\?\\)(?:\\s|$)");

Upvotes: 3

Woundorf
Woundorf

Reputation: 223

You could try with \B instead of \b:

QRegExp("\\B\\(\\?\\?\\)\\B");

Upvotes: 0

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