SCSS: Regexp simplification

Author: Golmote

components/prism-scss.js

@@ -21,14 +21,14 @@ Prism.languages.scss = Prism.languages.extend('css', {
 	// this one was hard to do, so please be careful if you edit this one :)
 	'selector': {
 		// Initial look-ahead is used to prevent matching of blank selectors
-		pattern: /(?=\S)[^@;\{\}\(\)]?([^@;\{\}\(\)]|&|#\{\$[-_\w]+\})+(?=\s*\{(\}|\s|[^\}]+(:|\{)[^\}]+))/m,
+		pattern: /(?=\S)[^@;{}()]?(?:[^@;{}()]|&|#\{\$[-\w]+\})+(?=\s*\{(?:\}|\s|[^}]+[:{][^}]+))/m,
 		inside: {
 			'parent': {
 				pattern: /&/,
 				alias: 'important'
 			},
-			'placeholder': /%[-_\w]+/,
-			'variable': /\$[-_\w]+|#\{\$[-_\w]+\}/
+			'placeholder': /%[-\w]+/,
+			'variable': /\$[-\w]+|#\{\$[-\w]+\}/
 		}
 	}
 });
@@ -44,20 +44,20 @@ Prism.languages.insertBefore('scss', 'atrule', {
 });
 
 Prism.languages.scss.property = {
-	pattern: /(?:[\w-]|\$[-_\w]+|#\{\$[-_\w]+\})+(?=\s*:)/i,
+	pattern: /(?:[\w-]|\$[-\w]+|#\{\$[-\w]+\})+(?=\s*:)/i,
 	inside: {
-		'variable': /\$[-_\w]+|#\{\$[-_\w]+\}/
+		'variable': /\$[-\w]+|#\{\$[-\w]+\}/
 	}
 };
 
 Prism.languages.insertBefore('scss', 'important', {
 	// var and interpolated vars
-	'variable': /\$[-_\w]+|#\{\$[-_\w]+\}/
+	'variable': /\$[-\w]+|#\{\$[-\w]+\}/
 });
 
 Prism.languages.insertBefore('scss', 'function', {
 	'placeholder': {
-		pattern: /%[-_\w]+/,
+		pattern: /%[-\w]+/,
 		alias: 'selector'
 	},
 	'statement': {