Faster logic for parser

Retrying to upload patch...

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The use of substr( $code, $offset ) is slow. Instead, we should be using the /A modifier (which I thought I was, maybe I didn't commit properly).

Calling preg_match with an offset only matches the beginning of the string flag if the offset is actually set to 0. This is annoying behavior, but I think the only way to force a beginning of string match from preg_match is actually to send it a truncated string.

(In reply to comment #3)

Calling preg_match with an offset only matches the beginning of the string flag
if the offset is actually set to 0. This is annoying behavior, but I think the
only way to force a beginning of string match from preg_match is actually to
send it a truncated string.

I know that, but as I said in my previous comment, you can use the /A modifier to do what you want.

http://au2.php.net/manual/en/reference.pcre.pattern.modifiers.php

Oh, neat. I learned regex in Python, and I'm pretty confident Python doesn't have that flag. By all means, that looks even better.

Done with a similar, but independent patch in r48806.