You shouldn't match for any character (.) but for any non-r character ( [^r] ) between your wanted 'r'.

Added: Additionally you should use anchors in your regex, otherwise it will match any line, in which your regex can match 4 r, even if there are more r's in that line.

In reply to Re: extract sentences with certain number of a character by linuxer
in thread extract sentences with certain number of a character by Anonymous Monk

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