Use str_starts_with() in a few more places

Some of these are technically slight behavior changes, but not
significant ones IMHO.

Author: lucaswerkmeister

src/Component.php

@@ -110,7 +110,7 @@ private function replaceMustacheVariables( DOMNode $node, array $data ) {
 	private function handleAttributeBinding( DOMElement $node, array $data ) {
 		/** @var DOMAttr $attribute */
 		foreach ( iterator_to_array( $node->attributes ) as $attribute ) {
-			if ( !preg_match( '/^:[\w-]+$/', $attribute->name ) ) {
+			if ( !str_starts_with( $attribute->name, ':' ) ) {
 				continue;
 			}
 

src/JsParsing/BasicJsExpressionParser.php

@@ -19,9 +19,9 @@ public function __construct( array $methods ) {
 	 */
 	public function parse( $expression ) {
 		$expression = $this->normalizeExpression( $expression );
-		if ( strncmp( $expression, '!', 1 ) === 0 ) {
+		if ( str_starts_with( $expression, '!' ) ) {
 			return new NegationOperator( $this->parse( substr( $expression, 1 ) ) );
-		} elseif ( strncmp( $expression, "'", 1 ) === 0 ) {
+		} elseif ( str_starts_with( $expression, "'" ) && str_ends_with( $expression, "'" ) ) {
 			return new StringLiteral( substr( $expression, 1, -1 ) );
 		} elseif ( preg_match( '/^(\w+)\((.*)\)$/', $expression, $matches ) ) {
 			$methodName = $matches[1];