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Regular Expression Details

Title Test Find Pattern Title
Expression
^([34|37]{2})([0-9]{13})$
Description
Validate against any american express number. All american express numbers start with either a 34 or 37, followed by 13 other numbers.
Matches
341256321524212 | 371524254523125
Non-Matches
425152365212542 | 34256321523621 | 3712563212523651
Author Rating: Not yet rated. Jeff Johns
Source
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