I've a regex which currently checks for a member number present in a string with memberNo between 6 and 9 in length
(?<memberNo>[0-9]{6,9})
What i need is if i get the input 123a456 that the regex ignores any alphanumeric characters in where the contiguous int values between 6 and 9 are present.
For example these should all match
123456
a123456
123a456
12345a6
etc
Seems
(?<memberNo>[0-9a-z]{6,9})
would match all your target strings. However, this pattern allows strings without a numeric character.
To mandate one or more numeric characters, positive lookahead could be used.
(?<memberNo>(?=.*[0-9])[1-9a-z]{6,9})
The (?=.*[0-9]) part is positive lookahead.
You can test this regex here https://regexr.com/5oua2
You can allow any letter between the digits using
(?<memberNo>(?:[a-zA-Z]?[0-9]){6,9})
See the regex demo.
Details
(?: - start of a non-capturing group:
[a-zA-Z]? - one or zero ASCII letters[0-9] - a single ASCII digits){6,9} - end of the group, repeat six to nine times.See the regex graph:
(?<memberNo>(?:[a-zA-Z]?[0-9]){6,9})or(?<memberNo>(?:[a-zA-Z]*[0-9]){6,9})