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Using quantifiers with zero-width regex elements runs until out of memory #2806

Kaiepi opened this issue Mar 31, 2019 · 2 comments


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commented Mar 31, 2019

The Problem

See title.

Expected Behavior

An exception should be thrown.

Actual Behavior

The code will run until the process runs out of memory.

Steps to Reproduce

bastille% perl6 -e "'If two astronauts were on the moon and one bashed the other\'s head in with a rock would that be fucked up or what?' ~~ / <wb>+ /" 
MoarVM panic: Memory allocation failed; could not allocate 36864 bytes


  • Operating system:
    OpenBSD bastille.kennel.qt 6.4 GENERIC.MP#683 amd64
  • Compiler version (perl6 -v):
    This is Rakudo version 2019.03 built on MoarVM version 2019.03
    implementing Perl 6.d.

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commented Mar 31, 2019


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commented Apr 1, 2019

In all but the simplest cases, this seems like a NP-hard problem to solve.

@lucasbuchala lucasbuchala added the regex label Apr 2, 2019

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