Hi monks,

I have at my work a little tricky task. It is a string matching problem. I want to compare two amino acid sequences (here in Letter code, single char represents one amino acid) to find at which positions one sequence lies in the other! example? 

MAAGAAAAFAAAATTTTTTTTFTTTTTTTTTTTTAAAAEAAAARAAAAAA # 1. sequence
             TTTTTTTTFTTTTTTTTTTTT                 # 2. sequence
result is: 2. lies at position 14 to 34 in 1.

[download]
simple? new examples 
SUBSTITUTION
AAAAEAAAARGAAATTTTFTTTTTTTTTTTTTTTTAAAAAAAAILVAAAAAAAA # 1. sequence
             TTTTFTTTATTTTTTDTTTTT                 # 2. sequence
DELETION
AAAAAAAAAAAAATTGTTTTTTTXXXXXTTTTTTTTTTMAAAAAAAAAAAAAAAA # 1. sequence
             TTGTTTTTTTTTTTTTTTTTM                 # 2. sequence

REVERSE
               TTTTTTTTTTTTTTTTTTTT  # 1. sequence
  AAAAAAAAAAAATTTTTTTTTTTTTTTTTTTTTAAAAAAAAAAAAAAAA # 2. sequence

PERFECT MATCHING ONLY AT BEGIN AND END OF 2. SEQUENCE
AAAAAAAAAAATTTTTTTTGGGGGGGGGGGGGGGGGGGGGTTTTTTTTTAAAAAAA # 1.sequence
           TTTTTTTTGGGNNGGGEEGGGEGGGGGGTTTTTTTTT    # 2. Sequence

[download]
I tried with the regexp and the module String::Approx and aslice with the option 'minimal_distance', but I don't like the return values for this module.

Any hints how to do "the best way"?

Murcia

edit (broquaint): dropped <pre> tags aand added formatting

In reply to similar string matching by Anonymous Monk

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