update elements and fix some bugs

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

 Prism.languages.vhdl = {
         'comment': /--.+/,
         // support for all logic vectors
         'vhdl-vectors': {
                 'pattern': /\b[oxb]"[\da-f_]+"|"[01uxzwlh-]+"/i,
                 'alias': 'number'
         },
-        'string': /"(\\\n|\\?.)*?"/,
-        'constant': /\b(use|library)\b/i,
+        // support for operator overloading included
+        'quoted-function': {
+                pattern: /"\S+?"(?=\()/,
+                alias: 'function'
+        },
+        'string': /"(?:[^\\\r\n]|\\?(?:\r\n|[\s\S]))*?"/,
+        'constant': /\b(?:use|library)\b/i,
         // support for predefined attributes included
-        'keyword': /\b('active|'ascending|'base|'delayed|'driving|'driving_value|'event|'high|'image|'instance_name|'last_active|'last_event|'last_value|'left|'leftof|'length|'low|'path_name|'pos|'pred|'quiet|'range|'reverse_range|'right|'rightof|'simple_name|'stable|'succ|'transaction|'val|'value|access|after|alias|all|architecture|array|assert|attribute|begin|block|body|buffer|bus|case|component|configuration|constant|disconnect|downto|else|elsif|end|entity|exit|file|for|function|generate|generic|group|guarded|if|impure|in|inertial|inout|is|label|library|linkage|literal|loop|map|new|next|null|of|on|open|others|out|package|port|postponed|procedure|process|pure|range|record|register|reject|report|return|select|severity|shared|signal|subtype|then|to|transport|type|unaffected|units|until|use|variable|wait|when|while|with)\b/i,
-        'boolean': /\b(true|false)\b/i,
-        'function': {
-                // support for operator overloading included
-                pattern: /([a-z0-9_]+|"\S+")\(/i,
-                inside: {
-                        punctuation: /\(/
-                }
-        },
+        'keyword': /\b(?:'active|'ascending|'base|'delayed|'driving|'driving_value|'event|'high|'image|'instance_name|'last_active|'last_event|'last_value|'left|'leftof|'length|'low|'path_name|'pos|'pred|'quiet|'range|'reverse_range|'right|'rightof|'simple_name|'stable|'succ|'transaction|'val|'value|access|after|alias|all|architecture|array|assert|attribute|begin|block|body|buffer|bus|case|component|configuration|constant|disconnect|downto|else|elsif|end|entity|exit|file|for|function|generate|generic|group|guarded|if|impure|in|inertial|inout|is|label|library|linkage|literal|loop|map|new|next|null|of|on|open|others|out|package|port|postponed|procedure|process|pure|range|record|register|reject|report|return|select|severity|shared|signal|subtype|then|to|transport|type|unaffected|units|until|use|variable|wait|when|while|with)\b/i,
+        'boolean': /\b(?:true|false)\b/i,
+        'function': /[a-z0-9_]+(?=\()/i,
         // decimal, based, physical, and exponential numbers supported
-        'number': /'[01uxzwlh-]'|\b\d+[_.]*(#[\da-f_.]+#)?(e[-+]?\d+)?/i,
-        'operator': /<=?|>=?|:=|[-+*/&=]|\b(abs|not|mod|rem|sll|srl|sla|sra|rol|ror|and|or|nand|xnor|xor|nor)\b/i,
+        'number': /'[01uxzwlh-]'|\b(?:\d+#[\da-f_.]+#|\d[\d_.]*)(?:e[-+]?\d+)?/i,
+        'operator': /[<>]=?|:=|[-+*/&=]|\b(?:abs|not|mod|rem|sll|srl|sla|sra|rol|ror|and|or|nand|xnor|xor|nor)\b/i,
         'punctuation': /[{}[\];(),.:]/
 };