Regular Expression - Match any string not starting with + but allow +1

I need a regular expression for JavaScript that will match any string that does not start with the `+` character. With one exception, strings starting with `+1` are okay. The empty string should also match. For example: "" = true "abc" = true "+1" = true "+1abc" = true "+2" = false "+abc" = false So far I have found that `^(\+1|[^+]?)$` takes care of the `+1` part but I cannot seem to get it to allow more characters after without invalidating the first part. I thought that `^(\+1|[^+]?).*?$` would work but it seems to match everything.

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