Question

I need a special regular expression and have no experience in them whatsoever, so I am turning to you guys on this one.

I need to validate a classifieds title field so it doesn’t have any special characters in it, almost.

Only letters and numbers should be allowed, and also the three Swedish letters å, ä, ö (upper- or lowercase).

Besides the above, these should also be allowed:

• The “&” sign.
• Parentheses “()”
• Mathematical signs “-“, “+”, “%”, “/”, “*”
• Dollar and Euro signs
• One accent signed letter: “é”. // Only this one is required
• Double quote and single quote signs.
• The comma “,” and point “.” signs

Answer 1

Try this:

^[\s\da-zA-ZåäöÅÄÖ&()+%/*$€é,.'"-]*$

Breakdown:

^ = matches the start of the string

[...]* = matches any characters (or ranges) inside the brackets one or more times

$ = matches the end of the string

Updated with all the suggestions from the comments. Thanks guys!