javascript - how to match uncertain numbers without special words before them with js regular expression

Question

For Example. I want to get the numbers without 'the' or 'abc' or 'he' before them;

1. the89 (no match)

2. thisis90 (match 90)

3. iknow89999 (match 89999)

4. getthe984754 (no match)

5. abc58934(no match)

6. he759394 (no match)

I try to use this (?<!(the|abc|he))[0-9]+ , but failed

Answer 1

You may use this regex with negative lookbehind:

(?<!t?he|abc|d)d+

RegEx Demo

RegEx Details:

• (?<!: Start negative lookbehind, to fail when we get any of:
  • t?he: the or he
  • |: OR
  • abc: abc
  • |: OR
  • d: a digit
• ): End negative lookbehind
• d+: Match 1+ digits