update elements and fix some bugs

lib/src/prism/components/prism-nasm.js

 Prism.languages.nasm = {
-    'comment': /;.*$/m,
-    'string': /("|'|`)(\\?.)*?\1/m,
-    'label': {
-        pattern: /^\s*[A-Za-z\._\?\$][\w\.\?\$@~#]*:/m,
-        alias: 'function'
-    },
-    'keyword': [
-        /\[?BITS (16|32|64)\]?/m,
-        /^\s*section\s*[a-zA-Z\.]+:?/im,
-        /(?:extern|global)[^;]*/im,
-        /(?: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,
-        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,
-    'operator': /[\[\]\*+\-\/%<>=&|\$!]/m
+        'comment': /;.*$/m,
+        'string': /("|'|`)(\\?.)*?\1/m,
+        'label': {
+                pattern: /(^\s*)[A-Za-z._?$][\w.?$@~#]*:/m,
+                lookbehind: true,
+                alias: 'function'
+        },
+        'keyword': [
+                /\[?BITS (16|32|64)\]?/m,
+                {
+                        pattern: /(^\s*)section\s*[a-zA-Z\.]+:?/im,
+                        lookbehind: true
+                },
+                /(?:extern|global)[^;\r\n]*/im,
+                /(?: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,
+                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,
+        'operator': /[\[\]*+\-\/%<>=&|$!]/
 };