Re^2: Composing regex's dynamically

You are joining strings, yet @parts contains compiled re's. Wouldn't that join the stringified forms of the regex's, not the compile stuff itself?

But I see the general point: Given $r1 and maybe $r2 as compiled regexs, I could say $r= qr/$r1|$r2/ Or if absent say $r=$r1;.

I'm finding that I'm limited in how I break up a huge regex into separate pieces. Pieces can contain named captures and MARK:names, and the assembled result works the same as if it were written as one big string. But a named recursive reference (?&name) must be present when the regex is compiled, not (just) when it is used later.

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Re^3: Composing regex's dynamically by Corion (Patriarch) on Apr 27, 2011 at 13:52 UTC
Regexes and strings are interchangeable. "Joining" two regexes (by interpolating them into a third) will join their stringified versions. If you want to "compile" a string to a regex, use `qr()` on the final string, like I did.	[reply] [d/l]
Re^4: Composing regex's dynamically by John M. Dlugosz (Monsignor) on Apr 27, 2011 at 15:41 UTC
One nice thing about Perl that's not present in other languages is that Regex is handled intrinsically rather than having to be a plain string first. That means, in particular, that we don't have to double-escape everything. \{ in a string literal becomes plain {, so you would have to write \\{ to get what you would normally write as \{ in a regular expression literal. So, you are saying that I can write the pieces as qr's (not plain strings), and the stringized form has everything escaped out so if I compile it again I get back the same regex? If I can mix qr literals and strings more freely without worrying, it will indeed be simpler.	[reply]
Re^5: Composing regex's dynamically by Corion (Patriarch) on Apr 27, 2011 at 16:05 UTC
See perlop on `qr`: It (the result of `qr`) magically differs from a string containing the same characters: ref(qr/x/) returns "Regexp", even though dereferencing the result returns undef. Basically, the difference between strings and regular expression objects is very, very thin from a user point of view.	[reply] [d/l] [select]
Re^6: Composing regex's dynamically by John M. Dlugosz (Monsignor) on Apr 28, 2011 at 08:15 UTC
Re^7: Composing regex's dynamically by Corion (Patriarch) on Apr 28, 2011 at 08:17 UTC
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