Question

Hi I am new to the regular expression.

Can someone tell how to format a regular expression pattern for validating Numbers with many spaces and special characters? here the space position are not defined.

I have tried like this ^[0-9]{0,12}$ but I don’t know how to place the spaces in-between ?

Ex:'2356 85 568#','5875 #2545','#2525','4567'

Answer 1

To allow any number of spaces, dashes and #-signs between up to 12 numbers, use this:

^[ #-]*([0-9][ #-]*){0,12}$

• initially 0 or more specials
• then 0-12 groups of
  • one digit
  • followed by 0 or more specials