A regular expression, or RegExp, is a way of describing a string of text using metacharacters or wild-card symbols. For example, the statement ABCd{6] would require the user to enter a value that contains “ABC” followed by a 6 digit number. You can use these expressions to validate text entered into custom fields.

For more information on Regular Expression with examples and tutorials, please follow the link below: http://www.regular-expressions.info

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