Could some one help me with the regular expression, where we can exclude certain numbers in between from a range of numbers.
Presently, ^([1-9][0][0-9])$ is the regular expression that is configured. Now if i want to exclude a few numbers/one number(501,504) from it, then how would the regular expression look/be.
Described in more detail in this answer, you can use the following regex with the “Negative Lookahead” command ?!:
^((?!501|504)[0-9]*)$
You can see the regex being executed & explained here: https://regex101.com/r/mL0eG4/1
/^((?!501|504)[0-9]*)$/mg
- ^ assert position at start of a line
- 1st Capturing group ((?!501|504)[0-9]*)
- (?!501|504) Negative Lookahead - Assert that it is impossible to match the regex below
- 1st Alternative: 501
- 501 matches the characters 501 literally
- 2nd Alternative: 504
- 504 matches the characters 504 literally
- [0-9]* match a single character present in the list below
- Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
- 0-9 a single character in the range between 0 and 9
- $ assert position at end of a line
- m modifier: multi-line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
- g modifier: global. All matches (don't return on first match)