@rahul Something like this should do it:

/^[0-9]{7}$/

I have used this but when I execute then its not validate. firstly call netsuite validation i.e "Phone number should have seven digits or more."

@rahul If NetSuite already have a validation what are you trying to do exaclty and in which script type/context?

Actually phone field is taking any character like space, string. i want to validate from 1st character. if anyone enter less than 7 character then it validate from my regular expression, not from netsuite validation.