in reply to Re: Regular expression * vs +
in thread Regular expression * vs +

Close, but not sure OP wants this (from mwah's example):

687551.pl syntax OK
perl  687551.pl
||
||
||
||
||
||
||
||
|123-UK 123-UK 123-UK|
||

[download]

Whereas:

my $txt = '-UK 123 123-UK 123-UK 123-UK abc-oops!';
print "|$1|\n" while $txt =~ /((?:\d+-UK\s))/g;

[download]

produces

perl  687551.pl
|123-UK |
|123-UK |
|123-UK |

[download]

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Re^3: Regular expression * vs +
by mwah (Hermit) on May 20, 2008 at 13:22 UTC

    I think the OP struggled over the difference between

     ...
 my $txt='-UK 123 123-UK 123-UK 123-UK';
 print "|$1| - match until pos:" . pos($txt) . "\n" while $txt=~/((?:\
+d+-UK\W?)+)/g ;
 ...

    [download]

    and

     ...
 my $txt='-UK 123 123-UK 123-UK 123-UK';
 print "|$1| - match until pos:" . pos($txt) . "\n" while $txt=~/((?:\
+d+-UK\W?)*)/g ;
 ...

    [download]

    which is the difference between (expr)+ and (expr)*, the latter matching everywhere and (of course) at 'expr', the former matching only at 'expr'.

    (maybe I misinterpreted his intention)

    Regards

    mwa

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