How to filter out lines from a variable that has multi-lines?

From: mike <needpassion@xxxxxxxxx>
Date: Fri, 28 Sep 2007 18:09:43 -0700

suppose a variable $a has multi-lines, e.g.

happy
new
new password
year
get password of micky
LOL

What is best way to filter out lines that have "password" involved?
Thanks in advance

.

Follow-Ups:
- Re: How to filter out lines from a variable that has multi-lines?
  - From: Tad McClellan
- Re: How to filter out lines from a variable that has multi-lines?
  - From: Narthring

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