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To match the following:
On Mar 3, 2011 11:05 AM, "mr person"
wrote:
I have the following regular expression:
/(On.* (?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) \d{1,2}, [12]\d{3}.* at \d{1,2}:\d{1,2} (?:AM|PM),.*wrote:)/m
Is there a way to make the at optional? so if it's there great, if not, it still matches?
917
A question mark ( ? ) immediately following a character means match zero or one instance of this character . This means that the regex Great!? will match Great or Great! .
asterisk or star ( * ) - matches the preceding token zero or more times. For example, the regular expression ' to* ' would match words containing the letter 't' and strings such as 'it', 'to' and 'too', because the preceding token is the single character 'o', which can appear zero times in a matching expression.
Sure. Put it in parentheses, put a question mark after it. Include one of the spaces (since otherwise you'll be trying to match two spaces if the "at" is missing.) (at )? (or as someone else suggested, (?:at )? to avoid it being captured).
63
Don't forget (?:) to make sure the bracketed expression doesn't get captured
(?:at)?
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