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Use it for questions about the Form API. Don't use it for entity or entity field forms.
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Accepted
Webform Validation Allow Lowercase Only
Figured it out - Regular Expression, case-sensitive:
Regex Code: [A-Z]
Negate Rule is checked.
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Webform Validation Allow Lowercase Only
I have an email field in a webform that will trigger a rule that checks against that field against a user's email. The issue is, rules is case sensitive so if the webform field had capitals, and the …