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Re^2: Detect STX and ETX hex in received string

by MidLifeXis (Monsignor)
on Nov 28, 2012 at 13:32 UTC ( #1006029=note: print w/replies, xml ) Need Help??

in reply to Re: Detect STX and ETX hex in received string
in thread Detect STX and ETX hex in received string

It appears that your solution only allows for a single-character STX or ETX token, due to the check for character classes (eg [$STX]). I am presently experiencing too much of a coffee deficiency to offer an alternative.

Update: ... and to not recognize that STX and ETX are possibly symbols for one character tokens :-)


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Re^3: Detect STX and ETX hex in received string
by ColonelPanic (Friar) on Nov 28, 2012 at 13:48 UTC
    I interpreted single-character STX and ETX codes as being intrinsic to the problem. Maybe that is not so, however. Here is a multi-character solution:
    use Modern::Perl; my $STX = 'foo'; my $ETX = 'bar'; my $re = qr{ $STX (?: (?<match>.*?) $ETX | (?:(?<match>.{80}))) }x; $_='foo12345678barfoo1234567890123456789012345678901234567'. '890123456789012345678901234567890123456789012345678901234567890bar'; say substr($+{match},0,80) while (/$re/g);

    (I added a substr() to limit the matched string to 80 characters. It appears to me that it's not trivial to meet these requirements entirely within the regex...though I'm sure others will quickly prove me wrong!)

    When's the last time you used duct tape on a duct? --Larry Wall

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