Hi All, I have a question,Initially I thought as a simple one !!! I have a header of a file which is some thing like 
SNP    Coor    Alleles    BM19228A    BM19228B    BM19229A    BM19229B
+    BM19231A

[download]
The BM* could be more that 100s.I need to prefix the BMs with a string which is XXXXX_.

Though I could slurp the first header line from the entire file and succeeded in changing the first BM19228A to XXXXX_BM19228A. I am stuch with progressing them with other BMs . Could any one please give suggestions or directions in doing it?
thanks a lot

In reply to regular expression ?! by Anonymous Monk

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