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Regex for matching a string with possible spaces at beginning and end of string with a hyphen in the middle

January 28, 2023

I’m trying to put together a js flavor of regex to match a string like in the following examples where there may be a whitespace at the front or back of the string, or both front and back. But not within the string

Examples:

'Z5LW-KRT2'       MATCH
' Z5LW-krt2'      MATCH
'Z5LW-KRT2 '      MATCH
' Z5LW-KRT2 '     MATCH

' Z5LW-K RT2 '    NO MATCH

So far i have come up with the below which matches if there is no whitespace anywhere, but i cant figure out how to include white space at the beginning or end but not within like in the examples

^[A-Za-z0-9\-]+$

>Solution :

You should add \s* to match spaces so the result regex should look like ^\s*[A-Za-z0-9\-]+\s*$ and even you can reduce it to ^\s*[\w\-]+\s*$ if you want to use the build-in class \w.