Bash: Regexp optimisation and simplification

Author: Golmote

components/prism-bash.js

@@ -10,7 +10,7 @@
 							pattern: /(^\$\(\([\s\S]+)\)\)/,
 							lookbehind: true
 						},
-						/^\$\(\(/,
+						/^\$\(\(/
 					],
 					number: /\b-?(?:0x[\dA-Fa-f]+|\d*\.?\d+(?:[Ee]-?\d+)?)\b/,
 					// Operators according to https://www.gnu.org/software/bash/manual/bashref.html#Shell-Arithmetic
@@ -26,8 +26,8 @@
 					variable: /^\$\(|^`|\)$|`$/
 				}
 			},
-			/\$(?:[a-z0-9_#\?\*!@]+|\{[^}]+\})/i
-		],
+			/\$(?:[\w#?*!@]+|\{[^}]+\})/i
+		]
 	};
 
 	Prism.languages.bash = {
@@ -42,29 +42,29 @@
 		'string': [
 			//Support for Here-Documents https://en.wikipedia.org/wiki/Here_document
 			{
-				pattern: /((?:^|[^<])<<\s*)(?:"|')?(\w+?)(?:"|')?\s*\r?\n(?:[\s\S])*?\r?\n\2/g,
+				pattern: /((?:^|[^<])<<\s*)["']?(\w+?)["']?\s*\r?\n(?:[\s\S])*?\r?\n\2/,
 				lookbehind: true,
 				greedy: true,
 				inside: insideString
 			},
 			{
-				pattern: /(["'])(?:\\\\|\\?[^\\])*?\1/g,
+				pattern: /(["'])(?:\\[\s\S]|(?!\1)[^\\])*\1/,
 				greedy: true,
 				inside: insideString
 			}
 		],
 		'variable': insideString.variable,
 		// Originally based on http://ss64.com/bash/
 		'function': {
-			pattern: /(^|\s|;|\||&)(?:alias|apropos|apt-get|aptitude|aspell|awk|basename|bash|bc|bg|builtin|bzip2|cal|cat|cd|cfdisk|chgrp|chmod|chown|chroot|chkconfig|cksum|clear|cmp|comm|command|cp|cron|crontab|csplit|cut|date|dc|dd|ddrescue|df|diff|diff3|dig|dir|dircolors|dirname|dirs|dmesg|du|egrep|eject|enable|env|ethtool|eval|exec|expand|expect|export|expr|fdformat|fdisk|fg|fgrep|file|find|fmt|fold|format|free|fsck|ftp|fuser|gawk|getopts|git|grep|groupadd|groupdel|groupmod|groups|gzip|hash|head|help|hg|history|hostname|htop|iconv|id|ifconfig|ifdown|ifup|import|install|jobs|join|kill|killall|less|link|ln|locate|logname|logout|look|lpc|lpr|lprint|lprintd|lprintq|lprm|ls|lsof|make|man|mkdir|mkfifo|mkisofs|mknod|more|most|mount|mtools|mtr|mv|mmv|nano|netstat|nice|nl|nohup|notify-send|npm|nslookup|open|op|passwd|paste|pathchk|ping|pkill|popd|pr|printcap|printenv|printf|ps|pushd|pv|pwd|quota|quotacheck|quotactl|ram|rar|rcp|read|readarray|readonly|reboot|rename|renice|remsync|rev|rm|rmdir|rsync|screen|scp|sdiff|sed|seq|service|sftp|shift|shopt|shutdown|sleep|slocate|sort|source|split|ssh|stat|strace|su|sudo|sum|suspend|sync|tail|tar|tee|test|time|timeout|times|touch|top|traceroute|trap|tr|tsort|tty|type|ulimit|umask|umount|unalias|uname|unexpand|uniq|units|unrar|unshar|uptime|useradd|userdel|usermod|users|uuencode|uudecode|v|vdir|vi|vmstat|wait|watch|wc|wget|whereis|which|who|whoami|write|xargs|xdg-open|yes|zip)(?=$|\s|;|\||&)/,
+			pattern: /(^|[\s;|&])(?:alias|apropos|apt-get|aptitude|aspell|awk|basename|bash|bc|bg|builtin|bzip2|cal|cat|cd|cfdisk|chgrp|chmod|chown|chroot|chkconfig|cksum|clear|cmp|comm|command|cp|cron|crontab|csplit|cut|date|dc|dd|ddrescue|df|diff|diff3|dig|dir|dircolors|dirname|dirs|dmesg|du|egrep|eject|enable|env|ethtool|eval|exec|expand|expect|export|expr|fdformat|fdisk|fg|fgrep|file|find|fmt|fold|format|free|fsck|ftp|fuser|gawk|getopts|git|grep|groupadd|groupdel|groupmod|groups|gzip|hash|head|help|hg|history|hostname|htop|iconv|id|ifconfig|ifdown|ifup|import|install|jobs|join|kill|killall|less|link|ln|locate|logname|logout|look|lpc|lpr|lprint|lprintd|lprintq|lprm|ls|lsof|make|man|mkdir|mkfifo|mkisofs|mknod|more|most|mount|mtools|mtr|mv|mmv|nano|netstat|nice|nl|nohup|notify-send|npm|nslookup|open|op|passwd|paste|pathchk|ping|pkill|popd|pr|printcap|printenv|printf|ps|pushd|pv|pwd|quota|quotacheck|quotactl|ram|rar|rcp|read|readarray|readonly|reboot|rename|renice|remsync|rev|rm|rmdir|rsync|screen|scp|sdiff|sed|seq|service|sftp|shift|shopt|shutdown|sleep|slocate|sort|source|split|ssh|stat|strace|su|sudo|sum|suspend|sync|tail|tar|tee|test|time|timeout|times|touch|top|traceroute|trap|tr|tsort|tty|type|ulimit|umask|umount|unalias|uname|unexpand|uniq|units|unrar|unshar|uptime|useradd|userdel|usermod|users|uuencode|uudecode|v|vdir|vi|vmstat|wait|watch|wc|wget|whereis|which|who|whoami|write|xargs|xdg-open|yes|zip)(?=$|[\s;|&])/,
 			lookbehind: true
 		},
 		'keyword': {
-			pattern: /(^|\s|;|\||&)(?:let|:|\.|if|then|else|elif|fi|for|break|continue|while|in|case|function|select|do|done|until|echo|exit|return|set|declare)(?=$|\s|;|\||&)/,
+			pattern: /(^|[\s;|&])(?:let|:|\.|if|then|else|elif|fi|for|break|continue|while|in|case|function|select|do|done|until|echo|exit|return|set|declare)(?=$|[\s;|&])/,
 			lookbehind: true
 		},
 		'boolean': {
-			pattern: /(^|\s|;|\||&)(?:true|false)(?=$|\s|;|\||&)/,
+			pattern: /(^|[\s;|&])(?:true|false)(?=$|[\s;|&])/,
 			lookbehind: true
 		},
 		'operator': /&&?|\|\|?|==?|!=?|<<<?|>>|<=?|>=?|=~/,