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I'm trying to match the From line all the way to the end of the Subject line in the following:
.... From: XXXXXX Date: Tue, 8 Mar 2011 10:52:42 -0800 To: XXXXXXX Subject: XXXXXXX .... So far I have:
/From:.*Date:.*To:.*Subject/m But that doesn't match to the end of the subject line. I tried adding $ but that had no effect.
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Multiline option, or the m inline option, enables the regular expression engine to handle an input string that consists of multiple lines. It changes the interpretation of the ^ and $ language elements so that they match the beginning and end of a line, instead of the beginning and end of the input string.
The RegExp m Modifier in JavaScript is used to perform multiline matching.
The "m" modifier specifies a multiline match. It only affects the behavior of start ^ and end $. ^ specifies a match at the start of a string.
The dot matches all except newlines (\r\n). So use \s\S, which will match ALL characters.
You can use the /m modifier to enable multiline mode (i.e. to allow . to match newlines), and you can use ? to perform non-greedy matching:
message = <<-MSG Random Line 1 Random Line 2 From: [email protected] Date: 01-01-2011 To: [email protected] Subject: This is the subject line Random Line 3 Random Line 4 MSG message.match(/(From:.*Subject.*?)\n/m)[1] => "From: [email protected]\nDate: 01-01-2011\nTo: [email protected]\nSubject: This is the subject line" See http://ruby-doc.org/core/Regexp.html and search for "multiline mode" and "greedy by default".
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