Rust: Regexp optimisation and simplification + don't use captures if …

…not needed

components/prism-rust.js

@@ -18,11 +18,11 @@ Prism.languages.rust = {
 	],
 	'string': [
 		{
-			pattern: /b?r(#*)"(?:\\?.)*?"\1/,
+			pattern: /b?r(#*)"(?:\\.|(?!"\1)[^\\\r\n])*"\1/,
 			greedy: true
 		},
 		{
-			pattern: /b?("|')(?:\\?.)*?\1/,
+			pattern: /b?("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,
 			greedy: true
 		}
 	],
@@ -35,23 +35,23 @@ Prism.languages.rust = {
 	},
 
 	'function': [
-		/[a-z0-9_]+(?=\s*\()/i,
+		/\w+(?=\s*\()/,
 		// Macros can use parens or brackets
-		/[a-z0-9_]+!(?=\s*\(|\[)/i
+		/\w+!(?=\s*\(|\[)/
 	],
 	'macro-rules': {
-		pattern: /[a-z0-9_]+!/i,
+		pattern: /\w+!/,
 		alias: 'function'
 	},
 
 	// Hex, oct, bin, dec numbers with visual separators and type suffix
-	'number': /\b-?(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(\d(_?\d)*)?\.?\d(_?\d)*([Ee][+-]?\d+)?)(?:_?(?:[iu](?:8|16|32|64)?|f32|f64))?\b/,
+	'number': /\b-?(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(\d(?:_?\d)*)?\.?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)(?:_?(?:[iu](?:8|16|32|64)?|f32|f64))?\b/,
 
 	// Closure params should not be confused with bitwise OR |
 	'closure-params': {
 		pattern: /\|[^|]*\|(?=\s*[{-])/,
 		inside: {
-			'punctuation': /[\|:,]/,
+			'punctuation': /[|:,]/,
 			'operator': /[&*]/
 		}
 	},