Re: regex matching number

Come to think of it it would have been good it I were able to debug a regex:

perl -de "$s=qq(1a2a3a4a5a); if ($s=~/(\d+)/){print $1};"
Default die handler restored.

Loading DB routines from perl5db.pl version 1.07
Editor support available.

Enter h or `h h' for help, or `perldoc perldebug' for more help.

main::(-e:1):   $s=qq(1a2a3a4a5a); if ($s=~/(\d+)/){print $1};
  DB<1> n
main::(-e:1):   $s=qq(1a2a3a4a5a); if ($s=~/(\d+)/){print $1};
  DB<1> p $_

  DB<2>
[download]

Is there any way to do this?

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Comment on Re: regex matching number Download Code

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Re: Re: regex matching number by shenme (Priest) on Sep 10, 2003 at 21:36 UTC
Works for me, that is, I am able to play with conditions and see what happens as I experiment. DB<1> $s=qq(1a2a3a4a5a); if ($s=~/(\d+)/){print $1}; 1 DB<2> $s=qq(1a2a3a4a5a); while ($s=~/(\d+)/g){print $1}; 12345 DB<3> $s=q(1a22b333c4567d89); DB<4> $re=qr~(\d+)~; DB<5> print $1 while $s =~ /$re/g; 122333456789 DB<6> $re=qr~(\d{3,})~; DB<7> print $1 while $s =~ /$re/g; 3334567 Just keep playing with inputs and patterns until you understand what is going on (or until you get something that works and then put 'study' on your to-do list ;-) And strangely enough, shortly before/after your question, in another thread antirice offered a suggestion to use a tool to try explaining what a RE means - see Re: Pattern Matching Question. Hey, that became next on my todo list!	[reply]

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Re: Re: regex matching number
by shenme (Priest) on Sep 10, 2003 at 21:36 UTC

  DB<1> $s=qq(1a2a3a4a5a); if ($s=~/(\d+)/){print $1};
1
  DB<2> $s=qq(1a2a3a4a5a); while ($s=~/(\d+)/g){print $1};
12345
  DB<3> $s=q(1a22b333c4567d89);

  DB<4> $re=qr~(\d+)~;

  DB<5> print $1 while $s =~ /$re/g;
122333456789
  DB<6> $re=qr~(\d{3,})~;

  DB<7> print $1 while $s =~ /$re/g;
3334567

And strangely enough, shortly before/after your question, in another thread antirice offered a suggestion to use a tool to try explaining what a RE means - see Re: Pattern Matching Question. Hey, that became next on my todo list!

[reply]