phone number regular expression problem

Hi,
I have a different requirement and it is :

I need to validate a phone number field.
It may or may not be a US phone number.

The constraints are :
***********************

# It should accept any number of numbers
# any number of - hyphens
# and one + symbol
# no other characters and alphabets are allowed

Thanks in advance

Venugopal.S

.

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