Validation using Javascript
Javascript validation of user input can be manually configured for each field, including the use of Regular Expressions.
$opts['fdd']['col_name']['js']['required'] = true;
$opts['fdd']['col_name']['js']['regexp'] = '/^[0-9]*$/';
$opts['fdd']['col_name']['js']['hint'] =
'Please enter only numbers in the "col_name" field.';
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