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Re^2: Perl Complains of Nested Quantifiers

by sunmaz (Novice)
on May 22, 2012 at 17:11 UTC ( #971834=note: print w/replies, xml ) Need Help??


in reply to Re: Perl Complains of Nested Quantifiers
in thread Perl Complains of Nested Quantifiers

Thanks. That clarifies things. Unfortunately, I am stuck using this ancient version due to various reasons.

Thanks everyone for all of your assistance in this matter.

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Re^3: Perl Complains of Nested Quantifiers
by demerphq (Chancellor) on May 22, 2012 at 21:33 UTC

    FWIW the "possessive modifier" is simply syntactic sugar for (?>...) so (?>x+) should produce exactly the same optree as x++.

    $ perl -Mre=debug -e'/x++/' Compiling REx "x++" Final program: 1: SUSPEND (8) 3: PLUS (6) 4: EXACT <x> (0) 6: SUCCEED (0) 7: TAIL (8) 8: END (0) anchored "x" at 0 (checking anchored) minlen 1 Freeing REx: "x++" $ perl -Mre=debug -e'/(?>x+)/' Compiling REx "(?>x+)" Final program: 1: SUSPEND (8) 3: PLUS (6) 4: EXACT <x> (0) 6: SUCCEED (0) 7: TAIL (8) 8: END (0) anchored "x" at 0 (checking anchored) minlen 1 Freeing REx: "(?>x+)"

    so there is nothing stopping you using it in 5.8.8

    ---
    $world=~s/war/peace/g

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