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Regular expressions can be used on Text fields to ensure that index data matches a required format.  (e.g. Email addresses). The regular expression dialect used is compatible with regular expressions used in JavaScript. More information is available via the Internet.  

Specify Regular Expression

A regular expression can be entered here.  By clicking the arrow button the user is presented with a list of basic elements and sample expressions.

Enter a value here to check...

This field is used to check whether regular expressions defined in the field above.  This is only for testing purposes.

Enter an example of a valid data string...

This is an optional entry that will be displayed as an example when a user enters a non-matching value.