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-rw-r--r--activemodel/lib/active_model/validations/format.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/validations/format.rb b/activemodel/lib/active_model/validations/format.rb
index bea57415b0..a473440b4e 100644
--- a/activemodel/lib/active_model/validations/format.rb
+++ b/activemodel/lib/active_model/validations/format.rb
@@ -6,7 +6,7 @@ module ActiveModel
def validate_each(record, attribute, value)
if options[:with]
regexp = option_call(record, :with)
- record_error(record, attribute, :with, value) if value.to_s !~ regexp
+ record_error(record, attribute, :with, value) unless regexp.match?(value.to_s)
elsif options[:without]
regexp = option_call(record, :without)
record_error(record, attribute, :without, value) if regexp.match?(value.to_s)