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Can someone help me create this regex. I need it to check to see if the string is either entirely whitespace(empty) or if it only contains positive whole numbers. If anything else it fails. This is what I have so far.
/^\s*|[0-9][0-9]*/
You’re looking for:
If you want a positive number without leading zeros, use
[1-9][0-9]*If you don’t care about whitespaces around the number, you can also try:
Note that you don’t want to allow partial matching, for example
123abc, so you need the start and end anchors:^...$.Your regex has a common mistake:
^\s*|\d+$, for example, does not enforce a whole match, as is it the same as(^\s*)|(\d+$), reading, Spaces at the start, or digits at the end.