how to find all strings matching a pattern in linux

Question

Can one suggest a grep command for finding a string in a list of files by providing a part of the string?

I have a list of files in a directory which contains email addresses. I want to extract all email addresses ending with a particular domain name. for example, i want to get a list of all emails ending with "@google.com" in a file.

Directory contains N number of files. The data in each file is a single line seperated with a comma. I have tried so many options with grep command and none worked.

Thanks,

jaypal singh · Accepted Answer · 2013-06-12 05:00:54Z

You can try something like:

grep -E -o "\b[a-zA-Z0-9.-_]+@google\.com\b" *.files

Basically include the list of characters in the [a-zA-Z0-9.-_] character class which constitutes acceptable email addresses.

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