grep doesn't allow printing capture groups. Use sed:

sed -E 's/abc-([0-9]+)-zzz-([0-9]+).*/\1\2/' file

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grep doesn't allow printing capture groups. Use sed:

sed -E 's/abc-([0-9]+)-zzz-([0-9]+).*/\1\2/' file

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Alternatively, if you have pcregrep then use this command to print first 2 capture groups:

pcregrep -o1 -o2 'abc-([0-9]+)-zzz-([0-9]+)' file

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