Regular expression to validate money with minimum value

Question

I am using below regular expression to validate money which works fine.

^\d{1,3}(,\d{3})*$

Now I want to add minimum amount also like minimum amount should be 20,000 Can anyone please help me out.

Fiddle: https://regexr.com/5h5bf

fiddle updated with correct expression

Answer 1

Reading the comments, I'm not sure if regex would be your way forward, yet you seem determined. It seems that you are looking to validate a comma-seperated string that needs to start at 20,000, where each second part of the number is 3 digits long. I came up with:

^(?:[2-9]\d|[1-9]\d\d|[1-9],\d{3})(?:,\d{3})+$

See the online demo

---

• ^ - Start string ancor.
• (?: - Open 1st non-capture group.
  • [2-9]\d - A digit ranging from 2-9 followed by any digit.
  • | - Or.
  • [1-9]\d\d - A digit ranging from 1-9 followed by any two digits.
  • | - Or.
  • [1-9],\d{3} - A digit ranging from 1-9 followed by a comma and any three digits.
  • ) - Close 1st non-capture group.
• (?: - Open 2nd non-capture group.
  • ,\d{3} - A comma followed by any three digits.
  • )+ - Close 2nd non-capture group and repeat at least once.
• $ - End string ancor.

---

As an alternative you could also use lookaheads, eg:

^(?=.{6,})(?!1.{5}$)[1-9]\d?\d?(?:,\d{3})+$

See the online demo

---

• ^ - Start string ancor.
• (?=.{6,} - Positive lookahead for at 6 or more characters.
• (?.1.{5}$) - Negative lookahead for 1 followed by 5 characters till end string.
• [1-9]\d?\d? - A digit ranging from 1-9 followed by two optional digits (you could also write [1-9]\d{0,2} ).
• (?: - Open 2nd non-capture group.
  • ,\d{3} - A comma followed by any three digits.
  • )+ - Close non-capture group and repeat at least once.
• $ - End string ancor.