refactor: use base array assertion utility

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---

Author: kgryte

lib/node_modules/@stdlib/regexp/color-hexadecimal/lib/main.js

@@ -20,13 +20,14 @@
 
 // MODULES //
 
-var contains = require( '@stdlib/assert/contains' );
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var format = require( '@stdlib/string/format' );
 
 
 // VARIABLES //
 
 var MODES = [ 'full', 'shorthand', 'either' ];
+var isMode = contains( MODES );
 
 
 // MAIN //
@@ -50,7 +51,7 @@ var MODES = [ 'full', 'shorthand', 'either' ];
 */
 function reColorHexadecimal( mode ) {
 	if ( arguments.length > 0 ) {
-		if ( !contains( MODES, mode ) ) {
+		if ( !isMode( mode ) ) {
 			throw new Error( format( 'invalid argument. Mode must be one of the following: "%s". Value: `%s`.', MODES.join( '", "' ), mode ) );
 		}
 	}