regex - regular expression for Indian mobile numbers

Question

I want regular expression for indian mobile numbers which consists of 10 digits.
The numbers which should match start with 9 or 8 or 7.

For example:

9882223456
8976785768
7986576783

It should not match the numbers starting with 1 to 6 or 0.

Answer 1

^[789]d{9}$ should do the trick.

^     #Match the beginning of the string
[789] #Match a 7, 8 or 9
d    #Match a digit (0-9 and anything else that is a "digit" in the regex engine)
{9}   #Repeat the previous "d" 9 times (9 digits)
$     #Match the end of the string

UPDATE

Some Telecom operators in india introduced new mobile number series which starts with digit 6.

for that use:

^[6-9]d{9}$