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>What OS are you using?
aix 5.3
using ksh

thnx so much!,

for some reason i needed to adjust it to this:
echo "11111*X*005010X279E~ST*270*1111111*005010X279~BHT*0011*11" | sed 's/.*\(005010X[0-9][0-9][0-9][A-Za-z]\).*$/\1/'

please consider this:

echo "11111*X*005010X279~ST*270*1111111*005010X279~BHT*0011*11" | sed 's/.*\(005010X(\d)(\d)(\d)[A-Za-z]*\).*$/\1/'i'm searching for first occurrence of 005010X [digit]...

right on!! thnx, that one did it. It works like a charm.

thnx guys, I appreciate it.

now for one of the if-statements I have down the code...

what type of construct would help me get only these 4 file ext variants?
*.270
*.276
*.270.txt...

This regex is supposed to accept files with extensions 270, 276, and "txt" only. Everything else should be discarded.

This is what I have. I'll spare you the rest of the code.

[..]
ext...