in reply to seeking expression to match "/mysearch/detail/966031"

You must escape / in regexes: 

perl -e "print $1 if $ARGV[0]=~/(\/newsearch\/detail\/96603)/" "bla vl
+a/newsearch/detail/96603 x"
/newsearch/detail/96603

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You can also choose a different delimiter instead of / see perlrequick for details and this way you prevent the leaning toothpick syndrome

L*

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Re^2: seeking expression to match "/mysearch/detail/966031"
by AnomalousMonk (Archbishop) on Nov 18, 2016 at 19:16 UTC
    You must escape / in regexes ...

    A literal delimiter character in a regex like  /...\/.../ must be escaped, but if the delimiter is within an interpolated string (as in the OPed regex), the regex compiler is quite happy with it: 

    c:\@Work\Perl>perl -wMstrict -le
"my $re = '.../...';
 ;;
 print 'match' if 'xxx/xxx' =~ /$re/;
"
match

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    Give a man a fish:  <%-{-{-{-<

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