Extract email addresses from text file using regex with bash or command line

Question

How can I grep out only the email address using a regex from a file with multiple lines similar to this. (a sql dump to be precise)

Unfortunately I cannot just go b

Answer 1

The best way to handle this is with a proper CSV parser. A simple way to accomplish that, if it's a one-time task, is to load the CSV file into your favorite spreadsheet software, then extract just the email field.

It is difficult to parse CSV with a regex, because of the possibility of escaped commas, quoted text, etc.

Consider, the following are valid email addresses, according to Internet standards:

• foo,bar@gmail.com
• foo"bar@gmail.com

If you know for a fact that you will never have this sort of data, then perhaps simple grep and awk tools will work (as in @anubhava's answer).