Simple Regular Expression required

Hi Experts,

I need a simple regular expression to be used in a RegularExpressionValidator ... in Webforms

conditions:    type is string, and values are 4 numbers, no more and no less.  eg.   "5555"

Thanks (little urgent).
simonm_jpAsked:
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amit_gCommented:
"[0-9]{4}"
amit_gCommented:
Shorthand "\d{4}"
ozoCommented:
^\d{4}$

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simonm_jpAuthor Commented:
ozo ... whats the difference between yours and amit's?

Cheers,
ozoCommented:
amit's would find a match in "555555"
simonm_jpAuthor Commented:
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