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I would like to change file with name like:

d1-a2_A1_B1.txt
abcd_A90_B2.txt

where I want to insert _FOO in between first _A[0-9]\+ and _B[0-9] so the file names becomes

d1-a2_A1_FOO_B1.txt
abcd_A90_FOO_B2.txt

But my regular expression doesnot work:

for f in $(ls); do mv $f \`echo $f | sed -e s/\(.*_A[0-9]\+\)\(_B[0-9].*\)/$1_FOO$2/\`; done

I tried with a single string:

echo abcd_A90_B2.txt | sed -e s/\(.*_A[0-9]\+\)\(_B[0-9].*\)/$1_FOO$2/

OK: this worked:

echo abcd_A90_B2.txt | sed -e 's/\(_A[0-9]\+\)\(_B[0-9]\)/\1_FOO\2/'
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  • Your posting would be greatly improved with better formatting. Here's a help page on how to format. I'd edit it myself, but there's another edit pending so I can't.
    – Tom Zych
    Nov 14 '15 at 12:09
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  • Add the -r option to sed (to get it to use extended regular expressions; it normally doesn't understand +).

  • Put your sed script into quotes (preferably single quotes).

  • Change $1 and $2 in your script to \1 and \2:

    sed -re 's/(._A[0-9]+)(_B[0-9].)/\1_FOO\2/'

Also,

  • For clarity, you might want to change `…` to $(…) — see this, this, and this — i.e., handle the echo | sed the same way you handle the ls.
  • It’s better to say for f in * (rather than for f in $(ls)).
  • You should quote shell variable references (e.g., echo "$f") unless you have a good reason not to, and you’re sure you know what you’re doing.
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  • I have tried but didn't work: echo abcd_A90_B2.txt | sed -e 's/(._A[0-9]+)(_B[0-9].)/$1_FOO$2/' that didn't change abcd_A90_B2.txt Nov 14 '15 at 5:06
  • OK, I revised my answer.
    – Scott
    Nov 14 '15 at 5:14
  • Thanks for this!! Apr 2 '20 at 12:10
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You can avoid using sed and other string manipulation by using mmv:

$ mmv -m -n  '*_A*_B*.txt' '#1_A#2_FOO_B#3.txt'
abcd_A90_B2.txt -> abcd_A90_FOO_B2.txt
d1-a2_A1_B1.txt -> d1-a2_A1_FOO_B1.txt

(Leave out the -n or replace it with -v to actually rename the files once you've confirmed all files are matched and renamed as you want.

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