regex multiline modifier and windows line endings


In regex, ^ and $ shoudl match start/end of a line when the 'm' /multiline modifier is set -- however I just spent the better part of the day trying to figure out why it wasn't working as expected. I used the query
test$
....and the text
test
test
test

Only the last instance of test would match -- that is expected without the multiline flag. ( http://tinyurl.com/dx86w ) however they should each match with the multiline flag so long as there's no additional whitespace after the fact ( http://tinyurl.com/7bap6 ).

Finally, out of ideas, I replaced \r\n with \n on all of my _POST data -- and presto, it worked. So, my question is -- why won't it work on data with windows line endings? Is there a built in function for changing the line ending style or something? It seems there should be a more elegant solution than running a find/replace on all of my user-input just to make sure the line ending style are liked by PCRE.

Thanks

A.
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