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I have been using following Regex to parse @username from posts in my application.
'/(^|\s)#(\w*[a-zA-Z_]+\w*)/
Can somebody explain me the purpose of (^|\s). What if I omit that part?
(^|\s)either matches the beginning of a string (^) or a space character (\s). This is in order to preventhallo#worldfrom matching as a mention.An alternative to that is using
\b(a word boundary). It has slightly different semantics, but it should work in this case.