How can check for numbers or http links in the text entered in a textbox

[savvy]

I'm developing a jobsite in which i'm working on Job Posting section.
When the job is posted by the employer or any other agency they need to
fill in all the related details in the respective textboxes. In the job
description section i've provided a multiline textbox, in which i want
to avoid them using telephone numbers and any http links. So, how can i
make a check whether they have entered any phone numbers or links in
the text.
Any help will be greatly appreciated

 

[KMA]

Regular expressions. Regex.

 

[savvy]

Thank you very much
That was a quick and a straight forward answer
I have looked into regex members, i think they will fit the bill
thanks once again