I want to validate the telephone number. I want to allow 0-9, *, +,-,(,
SPACE and ).
That means it should allow : (240) 643-9325

For that I tried :
                   <var-value>^[0-9()x+. -]*$</var-value>

This is working fine. But, I don't have any control in RegEx to check
whether user has entered valid set of '(' and ')'. I mean, its allowing  :
(240( 643-9325 as a valid number.

If you have an idea of how to check the sequece of brackets '(' and ')'.
Please share it with me.


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