Re: Matching multiple patterns with regex

don't have to add much, but if it's a "standard compliant" mail message:
RFC 2822 seems to state the "Subject:" and other keywords are case-INsensitive, so you should match /From:/i and /Subject:/i, respectively.
Email::Simple, as recommended by Athanasius, does already provide for this and other tiny quirks.

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Re^2: Matching multiple patterns with regex by afoken (Chancellor) on Oct 31, 2015 at 12:15 UTC
RFC 2822 seems to state the "Subject:" and other keywords are case-INsensitive ... and to make things worse, "2.2.3. Long Header Fields" allows to wrap lines so that the content is split over several lines. This is a single logical header line, split over several physical lines: `Subject: Mail parsing looks simple until you have read the RFCs` [download] Additionally, RFC2047 allows encoding of non-ASCII characters. Any mail parser should be able to handle that, too. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l]

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Re^2: Matching multiple patterns with regex
by afoken (Chancellor) on Oct 31, 2015 at 12:15 UTC

RFC 2822 seems to state the "Subject:" and other keywords are case-INsensitive

... and to make things worse, "2.2.3. Long Header Fields" allows to wrap lines so that the content is split over several lines. This is a single logical header line, split over several physical lines:

Subject: Mail
 parsing looks
 simple until you
 have 
 read 
 the 
 RFCs
[download]

Additionally, RFC2047 allows encoding of non-ASCII characters.

Any mail parser should be able to handle that, too.

Alexander

--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

[reply]
[d/l]