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use “grep” command to find txt files containing telephone number.
telephone number format could be:
"***-*******"
"**********"
"*** *******"
"***-***-****"
How to write it?
numbers are 3 digits (\d{3}), space or dash [\s-], 3 digits (\d{3}), space or dash [\s-], 4 digits (\d{4}).
Edit @Mark and Jed – good advice – made updates based off recommendations