Add a property to the Text Field component that accepts a regular expression that would evaluate the text input by the user. The Text Field component would also get all of the "validation" benefits that are included on the Numeric Entry Field component, but evaluated against the regex instead of a numeric range (invalid style, namely).

While this is possible in scripting, building it into the component provides much more rapid and easily learned development practices. It also makes the functionality mirror the Numeric Entry Field component, promoting consistency throughout the application. It could also be done browser-side at the js level.