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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.
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To match any character except a list of excluded characters, put the excluded charaters between [^ and ] . The caret ^ must immediately follow the [ or else it stands for just itself.
Example: Regex Number Range 1-20 Range 1-20 has both single digit numbers (1-9) and two digit numbers (10-20). For double digit numbers we have to split the group in two 10-19 (or in regex: "1[0-9]") and 20. Then we can join all these with an alternation operator to get "([1-9]|1[0-9]|20)".
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
You can repeat expressions with an asterisk or plus sign. A regular expression followed by an asterisk ( * ) matches zero or more occurrences of the regular expression. If there is any choice, the first matching string in a line is used.
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)
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