I have a regular expression to validate a string. But now I want to remove all th开发者_Python百科e characters that do not match my regular expression.
I recently asked a question about removing items from a vector. Well, the solution I got works, but I don\'t understand it - and I cannot find any documentation explaining it.
How can I reverse a predicate\'s return value, and remove the elements that return false instead of true?
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