Invalid range in character class Regex Firefox

Question

I got Invalid range in character class issue when trying to use regex

/^[a-zA-Zа-яА-ЯЁё0-9_-\s]{6,20}$/

But the issue is only in Firefox, in Chrome it's ok.

With this regex I am trying to say "only latin, russian letters, numbers, space and '_' and '-' signs allowed"

Try to put the `-` at the end or at the begining of the class or escape it. — Casimir et Hippolyte, May 06 '14 at 14:05
possible duplicate of [Accept international name characters in RegEx](http://stackoverflow.com/questions/8013897/accept-international-name-characters-in-regex) — Cerbrus, May 06 '14 at 14:05

score 5 · Accepted Answer · answered May 06 '14 at 14:07

The _-\s is creating a range between the underscore and space characters. You need to either escape the - as in _\-\s or put it at the end:

[a-zA-Zа-яА-ЯЁё0-9_\s-]

Also beware of the а-я range. If this is the same as the Latin 1 a the range may not be what you expect at all.

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