Custom Pattern Rules for Fluent Forms Fields
Validates chosen Fluent Forms fields against your own patterns, such as postcodes, order numbers or membership IDs, each with its own error message.
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Code
// Field name => array( pattern, error message ).
$wpide_ff_patterns = array(
'postcode' => array( '/^[A-Za-z0-9 \-]{3,10}$/', 'Please enter a valid postcode.' ),
'order_number' => array( '/^#?\d{4,10}$/', 'Order numbers contain 4 to 10 digits.' ),
);
add_filter( 'fluentform/validation_errors', function ( $errors, $data ) use ( $wpide_ff_patterns ) {
foreach ( $wpide_ff_patterns as $name => $rule ) {
$value = isset( $data[ $name ] ) && is_string( $data[ $name ] ) ? trim( $data[ $name ] ) : '';
if ( '' !== $value && ! preg_match( $rule[0], $value ) ) {
$errors[ $name ] = array( $rule[1] );
}
}
return $errors;
}, 10, 2 );Notes
Keys are field names (the Name Attribute in the field's Advanced Options); patterns are PHP regular expressions matched against the whole value.
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