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That approach is quite nice. Here's a unsightly twist on it:
#!/usr/bin/perl -wl use strict; use warnings; sub Prefix { my $p = shift; ($p)=$_=~join'','\A',map("(\Q$_",split//,$p),join'?',(')')x length( +$p)or return'' for @_; $p } while (<DATA>) { print "$_=> ", Prefix(split ' ',$_); } __DATA__ model4run1 model2run1 model4run2 model1run1 model4run1 model2run1 model4run2 abbot model4run1 model2run1 abbot model1run1 model4run1 model2run1 model4run2 monk model4run1 model2run1 monk model1run1 testing terse testing time
but I prefer the chop.

In reply to Re^3: Find common prefix from a list of strings by ysth
in thread Find common prefix from a list of strings by Albannach

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