[X-Unix] Any CLI multi-line regex find utilities out there?

[Alexandre Gauthier]

Scott J. Kramer wrote:

>> I would like to do something like:
>>
>> echo 'my very long text from a email body' | myRegexCmd 'regex
>> expression'
>
>
> Not quite sure what you're trying to do but using echo if the "very long
> text" string has multiple lines may prove to be troublesome.
>
It just occured to me, why can't you do something such as

cat file_containing_very_long_text_from_a_email_body | grep --yourstuff 
'your regex'
?