Configuring Input Control Behavior

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When defining text input controls, the default server behavior allows empty strings, even if you have configured a regular expression and made the input control mandatory. Use this setting to enforce the regular expression even on empty strings, thus forcing the user to provide a conforming value for the input control.

Input Control Behavior
Configuration File
.../WEB-INF/applicationContext-cascade.xml
Bean	Description
applyRegexpToEmptyString	The default value of false gives the traditional behavior: even if a regular expression is defined, it is not applied to empty strings. If you want to strictly enforce the regular expression, even on empty input strings, set this property to true.