Need Regular Expression for 30 character limit with no spaces or special characters

[chrish5]

Hi Community,

I am currently using a regular expression of .{1,30} to limit the characters to 30 on a field.  I want to add to it so no spaces (beginning, middle or end) are allowed and no special characters are allowed.  Can anybody help with this?   Thanks!

[chrish5]

Yup, works correctly trying it from the Catalog Item, but not the Service Portal.  Thanks for your help Peter. 

[SwarnadeepNandy]

Hello @chrish5,

To limit the characters to 30 on a field, and also exclude spaces and special characters, you can use the following regular expression:

^[a-zA-Z0-9]{1,30}$

This regular expression means:

• ^: The start of the string or line
• [a-zA-Z0-9]: A character class that matches any alphanumeric character (upper or lower case letters or digits)
• {1,30}: A quantifier that specifies the minimum and maximum number of repetitions of the previous element (in this case, the character class)
• $: The end of the string or line

This regular expression will only match strings or lines that consist of 1 to 30 alphanumeric characters, and nothing else. It will not allow any spaces or special characters, such as punctuation marks, symbols, or whitespace characters.

You can test this regular expression online using a tool like RegExr or Regex101.

Hope this helps.

Kind Regards,

Swarnadeep Nandy

[Peter Bodelier]

Hi @SwarnadeepNandy,

That is actually exactly the same, only more complicated looking by splitting up [A-z] to [azA-Z] 🙂

[SwarnadeepNandy]

Essentially Yes. Just Different ways of writing.