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Misc Ruby Regex
URL with or without protocol (http or https)
/^((http|https?:\/\/)?((?:[-a-z0-9]+\.)+[a-z]{2,}))$/
Date format mm/dd/yyyy
/^(0[1-9]|1[012])[\/](0[1-9]|[12][0-9]|3[01])[\/][0-9]{4}$/
Limit string character
/^([a-z]|[A-Z]){1,3}$/
