regular expressions

Ok. So, to make sure, for the string 'four 3 8 10 six 9 10 8 8' the correct output would be '8 10', '9 10 8 8' Is that correct? If so, '((?:(?:8|9|10)\s)*(?:8|9|10))' appears to do the trick. Not extensively tested though.

This can be done exactly as you said in the question.

This is a short code for test of your input Mary_d9 with in your question mentioned requested sequences: https://code.sololearn.com/W464rI07K52h/?ref=app

Two questions: will there always be 3 numbers, or will the number vary, and what language are you using?

Russ The text can contain different numbers and even dates, but I only need 8, 9 and 10. There is a space separator between them. I will execute the command with regex in bash.

Russ thank you!