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

…not needed

components/prism-nasm.js

@@ -1,24 +1,24 @@
 Prism.languages.nasm = {
 	'comment': /;.*$/m,
-	'string': /("|'|`)(\\?.)*?\1/m,
+	'string': /(["'`])(?:\\.|(?!\1)[^\\\r\n])*\1/,
 	'label': {
 		pattern: /(^\s*)[A-Za-z._?$][\w.?$@~#]*:/m,
 		lookbehind: true,
 		alias: 'function'
 	},
 	'keyword': [
-		/\[?BITS (16|32|64)\]?/m,
+		/\[?BITS (?:16|32|64)\]?/,
 		{
-			pattern: /(^\s*)section\s*[a-zA-Z\.]+:?/im,
+			pattern: /(^\s*)section\s*[a-zA-Z.]+:?/im,
 			lookbehind: true
 		},
-		/(?:extern|global)[^;\r\n]*/im,
+		/(?:extern|global)[^;\r\n]*/i,
 		/(?:CPU|FLOAT|DEFAULT).*$/m
 	],
 	'register': {
-		pattern: /\b(?:st\d|[xyz]mm\d\d?|[cdt]r\d|r\d\d?[bwd]?|[er]?[abcd]x|[abcd][hl]|[er]?(bp|sp|si|di)|[cdefgs]s)\b/i,
+		pattern: /\b(?:st\d|[xyz]mm\d\d?|[cdt]r\d|r\d\d?[bwd]?|[er]?[abcd]x|[abcd][hl]|[er]?(?:bp|sp|si|di)|[cdefgs]s)\b/i,
 		alias: 'variable'
 	},
-	'number': /(\b|-|(?=\$))(0[hx][\da-f]*\.?[\da-f]+(p[+-]?\d+)?|\d[\da-f]+[hx]|\$\d[\da-f]*|0[oq][0-7]+|[0-7]+[oq]|0[by][01]+|[01]+[by]|0[dt]\d+|\d*\.?\d+(\.?e[+-]?\d+)?[dt]?)\b/i,
+	'number': /(?:\b|-|(?=\$))(?:0[hx][\da-f]*\.?[\da-f]+(?:p[+-]?\d+)?|\d[\da-f]+[hx]|\$\d[\da-f]*|0[oq][0-7]+|[0-7]+[oq]|0[by][01]+|[01]+[by]|0[dt]\d+|\d*\.?\d+(?:\.?e[+-]?\d+)?[dt]?)\b/i,
 	'operator': /[\[\]*+\-\/%<>=&|$!]/
 };