Thank you very much. This will help me.
Can we perfom a match by first concating the 2 strings and then querying on it.
   my $left = "xfafasfsdfasdfasdsfFOOBAR";
   my $right = "FOOBAR4t11";
   # my $concat = "xfafasfsdfasdfasdsfFOOBARFOOBAR4t11";
   my $concat = $left,$right;

[download]

I should be able to hold on to FOOBAR in a back reference so that I can do further manipulation.
I need it this way because I do not know the size of boundaries which will match and I would like to match the maximum characters possible to match.
After this match the two sub strings should be concatnated. this concatnated string will have a single copy of FOOBAR in the middle. like 
   my $conc = "xfafasfsdfasdfasdsfFOOBAR4t11";

[download]
now this concatnated string will need to matched with one more string let us say 
   my $str3 = "AR4t11xysadgsfje";

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Now AR4t11 will match and the above process is repeated.
How efficient will this be if I have about sub strings of size about 500 each and I need to compare about 10000 such sequences with each other.

Thank you.
braj

In reply to Re: Re: What is the Regular expression to search for boundry match for two strings? by Anonymous Monk
in thread What is the Regular expression to search for boundry match for two strings? by Anonymous Monk

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