Regex for numbers. Notes: The pattern will match everything up to the first semicolon, but exclud...

Regex for numbers. Notes: The pattern will match everything up to the first semicolon, but excluding the semicolon. It's just that I'm a bit confused about why the first question mark and colon are there. Matches: I bought sheep. In case it is JS it indicates the start and end of the regex, like quotes for strings. I tried usi Oct 15, 2009 · May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?=. refers to any character, be it a number, an aplhabet character, or any other special character. Could you explain me with some examples their usefulness? I don't understand them enough. . I bought five sheep. stackoverflow. dvsf ospxe uzppht irzj stncn yki xamrq drs dezqk zlo