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Thanks that does work too, with one minor change. The ")" has to be a "}", which I am guessing was just a typo. :)

grep -oE 'word1_a[0-9]{6}' infile

THANK YOU!!

I knew that grep -o would find the word instead of the entire line, I didn't know I could use the [0-9] to get the additional characters.

Thanks again!

My file looks like this now

word1_a123456
word1_a987654

It gives me the number, but also changes the entire line of the file to just have word1_a123456 as that line. I don't want to change...

I plan to use sed in a script to replace a string. My problem is the last 6 characters of the word to be replaced can be different each time, plus it's not always in the same spot on the line so I...