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Re^4: Regex in json: escaping forward slash

by mhearse (Chaplain)
on Aug 22, 2012 at 23:37 UTC ( #989169=note: print w/replies, xml ) Need Help??

in reply to Re^3: Regex in json: escaping forward slash
in thread Regex in json: escaping forward slash

Thanks for your reply. I made a poor assumption. I was under the impression that:
my $regex = ".*/home/members/index.htm.*"; if (/$regex/)
Was the same as
if (/.*/home/members/index.htm.*/)
Which would fail. I was wrong!

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Re^5: Regex in json: escaping forward slash
by davido (Archbishop) on Aug 22, 2012 at 23:42 UTC

    perlop (Gory Details of Parsing Quoted Constructs): "The most important Perl parsing rule is the first one discussed below: when processing a quoted construct, Perl first finds the end of that construct, then interprets its contents."

    m// is a quoted construct. So the "end" will be found before the contents are interpreted (including interpolated). Now if you say, "m/a/b/", the problem is that the end is found between 'a' and 'b'. But when you say, $c='/', and then m/a${c}b/, the end is found after 'b', and later the interpolation of $c takes place.


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