Q:

Regular Expression for starting woth specfic number

How to write regular expression for following conditions:

Should have only numbers 
Must be 8 digits long
Must start with 8 or 9 or 6

So for I can do only for first two conditions. I am not sure how to do the third conditions
My code is 
 if (!preg_match('/^[0-9]{8}$/', $number))

A:

You're almost there. Simply remove the first number from the character class and validate it at the start of your pattern...
/^(8|9|6)\d{7}$/

FYI - \d is the escape sequence for digits. I suppose you could also use this
/^[896]\d{7}$/

as it means about the same thing when you're only watching for a single character at the start.

