discourse/lib/validators/regex_setting_validation.rb

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module RegexSettingValidation
def initialize_regex_opts(opts = {})
@regex = Regexp.new(opts[:regex]) if opts[:regex]
@regex_error = opts[:regex_error] || 'site_settings.errors.regex_mismatch'
end
def regex_match?(val)
if @regex && !(val =~ @regex)
@regex_fail = true
return false
end
true
end
end