Creating a New Expression
To define a new expression, perform the following steps:
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On the Admin tab, open the Expressions subview of the Site Management view. The Expressions view opens.

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Click Add New Expression. The following form opens:
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In the Name field, enter a descriptive name for this new validation expression. The name that you enter here will identify this expression in the Answer Format list on the Create New Question dialog box.
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In the Expression field, enter an expression that will validate the user-entered response to its associated question. For example, if the question asked the user to input their zip code, the expression must check to see if the user enters 5 numeric characters.
infoFor information on writing JavaScript regular expressions, see the Regular-Expressions.info site at:
http://www.regular-expressions.info/javascript.html -
In the Sample Format field, enter the format that the expression validates. This value will be displayed under the form field requiring validation.
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Click Add Expression.
See Also