Regex to 'dissallow special symbols or spaces', but 'allow numbers and 'uppercase' OR 'lowercase' letters'

Question

I already use this regex: "^[0-9a-zA-Z]{6,}$"

it allows: numbers, uppercase letters, lowercase letters. it disallows: whitespaces and special characters or symbols.

But I want to modify it to:

- allow: numbers, and either uppercase letters or lowercase letters.
- disallow: whitespaces and special characters or symbols.

Actually i want to use it as regex for Transaction ID.

Valid examples:

Invalid Examples:

score 1 · Answer 1 · answered Feb 06 '19 at 18:13

1

You can use this

^(?:[\da-z]+|[\dA-Z]+)$

answered Feb 06 '19 at 18:13

Code Maniac

Could you explain the significance of the `?:` character pair? – dgnuff Feb 06 '19 at 22:46
@dgnuff `?:` is used to make groups non-capturing. https://stackoverflow.com/questions/3512471/what-is-a-non-capturing-group-what-does-do – Code Maniac Feb 07 '19 at 05:20

SolidSnake · Answer 2 · 2019-02-07T05:50:09.810

1

something like /^([0-9a-z]+|[0-9A-Z]+)$/m should do it.

edited Feb 07 '19 at 05:50

answered Feb 06 '19 at 18:17

SolidSnake

@Bsquare it is an answer.. check the request and this is a solution – SolidSnake Feb 06 '19 at 22:59
1

using `i` flag will result in case insensitivity will which lead to wrong results. – Code Maniac Feb 07 '19 at 05:21
1

@CodeManiac - right I forgot to remove it when I copied it from my testing pad. thanks I fixed it – SolidSnake Feb 07 '19 at 05:50

2 Answers2