In that case (and also because I'm only now reading this node), there's this based on a common prefix removal whim I had in the past (with partial credits to moritz for tidying up my original code as seen on my scratchpad): 
#!/usr/bin/perl

use strict;
use warnings;

my @array_of_test_names = (
                           'History - Family History - Suite with Pati
+ent - Clinic - Select Remove(-) Icon of Relative. - Clinic',
                           'History - Family History - Suite with Pati
+ent - Clinic - Save after Entering values in all fields - Clinic',
                           'History - Family History - Suite with Pati
+ent - Clinic - Select Add(+) Icon of Relative. - Clinic',
                           'History - Family History - Suite with Pati
+ent - Clinic - Multiple selection of relatives - Clinic',
                           'History - Family History - Suite with Pati
+ent - Clinic - Interaction Checking message not provided if procedure
+ code is selected - Clinic',
                           'History - Family History - Suite with Pati
+ent - Clinic - Interaction Checking message provided if no procedure 
+code is selected - Clinic',
                          );

my @second_sample_array = (
                           'WorkCenter - List Patients - To check the 
+items displayed in Filter By combo box',
                           'WorkCenter - List Patients - To check Filt
+er By combo box when no patients are assigned on initial login',
                           'WorkCenter - List Patients - Order in whic
+h patients are displayed',
                          );

sub getleastcommonprefix {
    my @searcharray = @_;
    my $common      = $searcharray[0];
    foreach my $index (1 .. $#searcharray) {
        $_ = $searcharray[0] . reverse $searcharray[$index];
        m/(.*)(.*)(??{quotemeta reverse $1})/s;
        if (length $1 < length $common) {
            $common = $1;
        }
    } ## end foreach my $index (1 .. $#searcharray)
    return $common;
} ## end sub getleastcommonprefix

print 'Common prefix for first sample [' . getleastcommonprefix(@array
+_of_test_names) . "]\n";
print 'Common prefix for second sample [' . getleastcommonprefix(@seco
+nd_sample_array) . "]\n";

[download]
Which gives the following output: 
Common prefix for first sample [History - Family History - Suite with 
+Patient - Clinic - ]
Common prefix for second sample [WorkCenter - List Patients - ]

[download]

In reply to Re^3: Find the common beginning substring in an array of strings by Neighbour
in thread Find the common beginning substring in an array of strings by technojosh

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