Regex and not condition

Question

I have below two regex expressions

• \d{13,16} - Number containing digits 0-9 of length 13 to 16
• 599999\d{10} - Number starting with 599999 followed by digits 0-9 and of length 16 digits

I want to say A and NOT B. How can I do that.

Thanks in advance for any help.

Answer 1

Try this:

^(?!599999\d{10})\d{13,16}$

Click for Demo

Explanation:

• ^ - asserts the start of the string
• (?!599999\d{10})- negative lookahead to validate that the string does not start with 599999 followed by 10 digits
• \d{13,16} - matches 13 to 16 digits
• $ - asserts the end of the string

Edit:

If these numbers are in the same line, you can use this instead \b(?!599999\d{10})\d{13,16}\b