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Re^3: Perl Complains of Nested Quantifiers

by demerphq (Chancellor)
on May 22, 2012 at 21:33 UTC ( #971883=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Perl Complains of Nested Quantifiers
in thread Perl Complains of Nested Quantifiers

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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