regarding regular expression

[bhargavigupta]

hi,
In my application i have one textbox which is taking input as U.S phone number so in tis case i used regular expression validator for this but in this case i have to give the format like xxx-xxx-xxxx

instead of this i have enter only numbers like xxxxxxxx and it has to divide the numbers and print like xxx-xxx-xxxx and it has to take only 10 digits
how can i validate this field

[kenobewan]

Here is an article that may help:
The 30 Minute Regex Tutorial