What does the regular expression for "email:password" look like?

Question

linux

There is a ready-made

([a-z0-9,!#\$%&\*\+/=\?\^_`\{\|}~-]+(\.[a-z0-9,!#\$%&\*\+/=\?\^_`\{\|}~-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,})[ ]?:.*)

however, when used with grep it doesn't output anything
Example file

[email protected]:123
[email protected]:1234

Answer 1

What about egrep?