unix - Can't extract pattern from filename -


getting errors following sed command:

echo 20130521_onepki_p107336_app.pfx | sed -e 's/_\([pp][0-9]+\)_/\1/'

instead of returning p107336, returning full filenam 20130521_onepki_p107336_app.pfx.

any ideas why happening, , how can restrict output pattern like?

the captures should escaped parentheses , can use case-insensitive match i, also, replacing capture part captured part no changes made. 1 matches entire line , replaces captured pattern:

sed -e 's/.*_\([pp][0-9][0-9]*\)_.*/\1/'

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