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Why does a Perl 5.6 regex run a lot slower on Perl 5.8?

by perldeveloper (Scribe)
on Aug 13, 2004 at 12:59 UTC ( [id://382646]=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
    Total Elapsed Time = 0.080048 Seconds
      User+System Time = 0.080048 Seconds
    ...
     0.00   0.000  0.000      1   0.0000 0.0000  strict::bits
     0.00   0.000  0.000      1   0.0000 0.0000  Exporter::import
     0.00   0.000  0.000      1   0.0000 0.0000  warnings::bits
    
  2. or download this
    Total Elapsed Time = 123.5199 Seconds
      User+System Time = 39.62993 Seconds
    ...
     0.00       - -0.000      2        -      -  strict::import
     0.00       - -0.000      3        -      -  main::BEGIN
     0.00       - -0.000      5        -      -  utf8::BEGIN
    
  3. or download this
    %Time ExclSec CumulS #Calls sec/call Csec/c  Name
     98.4   0.630  0.630     40   0.0157 0.0157  main::extract
    ...
     0.00       - -0.000      1        -      -  strict::import
     0.00       - -0.000      1        -      -  strict::bits
     0.00       -  0.010      2        - 0.0050  main::BEGIN
    
  4. or download this
    use strict;
    use warnings;
    ...
    
         return ();
    }
    
  5. or download this
    %Time ExclSec CumulS #Calls sec/call Csec/c  Name
     88.1   0.670  0.670      1   0.6700 0.6700  main::extract
    
  6. or download this
    %Time ExclSec CumulS #Calls sec/call Csec/c  Name
     95.0   2.490  2.510      1   2.4900 2.5100  main::extract
    
  7. or download this
    %Time ExclSec CumulS #Calls sec/call Csec/c  Name
     19.5   0.080  0.080      1   0.0800 0.0800  main::extract
    
  8. or download this
        usethreads=undef use5005threads=undef useithreads=undef usemultipl
    +icity=undef
        useperlio=undef d_sfio=undef uselargefiles=undef usesocks=undef
        use64bitint=undef use64bitall=undef uselongdouble=undef
    
  9. or download this
        usethreads=define use5005threads=undef useithreads=define usemulti
    +plicity=define
        useperlio= d_sfio=undef uselargefiles=define usesocks=undef
        use64bitint=undef use64bitall=undef uselongdouble=undef
    
  10. or download this
        usethreads=undef use5005threads=undef useithreads=undef usemultipl
    +icity=undef
        useperlio=undef d_sfio=undef uselargefiles=undef usesocks=undef
        use64bitint=undef use64bitall=undef uselongdouble=undef
    
  11. or download this
    $text =~ /(.*?)<whatever>/
    
  12. or download this
    $text =~ /^(.*?)<whatever>/
    

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