Added test for unused capturing groups (#1996)

This adds a test that checks for unused capturing groups in patterns and another test which ensures that lookbehind groups are always the first thing being matched in a pattern.

components/prism-cil.js

@@ -1,27 +1,27 @@
 Prism.languages.cil = {
 	'comment': /\/\/.*/,
-	
+
 	'string': {
 		pattern: /(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
 		greedy: true
 	},
-	
+
 	'directive': {
 		pattern: /(^|\W)\.[a-z]+(?=\s)/,
 		lookbehind: true,
 		alias: 'class-name'
 	},
-	
+
 	// Actually an assembly reference
 	'variable': /\[[\w\.]+\]/,
-	
-	
+
+
 	'keyword': /\b(?:abstract|ansi|assembly|auto|autochar|beforefieldinit|bool|bstr|byvalstr|catch|char|cil|class|currency|date|decimal|default|enum|error|explicit|extends|extern|famandassem|family|famorassem|final(?:ly)?|float32|float64|hidebysig|iant|idispatch|implements|import|initonly|instance|u?int(?:8|16|32|64)?|interface|iunknown|literal|lpstr|lpstruct|lptstr|lpwstr|managed|method|native(?:Type)?|nested|newslot|object(?:ref)?|pinvokeimpl|private|privatescope|public|reqsecobj|rtspecialname|runtime|sealed|sequential|serializable|specialname|static|string|struct|syschar|tbstr|unicode|unmanagedexp|unsigned|value(?:type)?|variant|virtual|void)\b/,
-	
-	'function': /\b(?:(?:constrained|unaligned|volatile|readonly|tail|no)\.)?(?:conv\.(?:[iu][1248]?|ovf\.[iu][1248]?(?:\.un)?|r\.un|r4|r8)|ldc\.(?:i4(?:\.[0-9]+|\.[mM]1|\.s)?|i8|r4|r8)|ldelem(?:\.[iu][1248]?|\.r[48]|\.ref|a)?|ldind\.(?:[iu][1248]?|r[48]|ref)|stelem\.?(?:i[1248]?|r[48]|ref)?|stind\.(i[1248]?|r[48]|ref)?|end(?:fault|filter|finally)|ldarg(?:\.[0-3s]|a(?:\.s)?)?|ldloc(?:\.[0-9]+|\.s)?|sub(?:\.ovf(?:\.un)?)?|mul(?:\.ovf(?:\.un)?)?|add(?:\.ovf(?:\.un)?)?|stloc(?:\.[0-3s])?|refany(?:type|val)|blt(?:\.un)?(?:\.s)?|ble(?:\.un)?(?:\.s)?|bgt(?:\.un)?(?:\.s)?|bge(?:\.un)?(?:\.s)?|unbox(?:\.any)?|init(?:blk|obj)|call(?:i|virt)?|brfalse(?:\.s)?|bne\.un(?:\.s)?|ldloca(?:\.s)?|brzero(?:\.s)?|brtrue(?:\.s)?|brnull(?:\.s)?|brinst(?:\.s)?|starg(?:\.s)?|leave(?:\.s)?|shr(?:\.un)?|rem(?:\.un)?|div(?:\.un)?|clt(?:\.un)?|alignment|ldvirtftn|castclass|beq(?:\.s)?|mkrefany|localloc|ckfinite|rethrow|ldtoken|ldsflda|cgt\.un|arglist|switch|stsfld|sizeof|newobj|newarr|ldsfld|ldnull|ldflda|isinst|throw|stobj|stloc|stfld|ldstr|ldobj|ldlen|ldftn|ldfld|cpobj|cpblk|break|br\.s|xor|shl|ret|pop|not|nop|neg|jmp|dup|clt|cgt|ceq|box|and|or|br)\b/,
-	
+
+	'function': /\b(?:(?:constrained|unaligned|volatile|readonly|tail|no)\.)?(?:conv\.(?:[iu][1248]?|ovf\.[iu][1248]?(?:\.un)?|r\.un|r4|r8)|ldc\.(?:i4(?:\.[0-9]+|\.[mM]1|\.s)?|i8|r4|r8)|ldelem(?:\.[iu][1248]?|\.r[48]|\.ref|a)?|ldind\.(?:[iu][1248]?|r[48]|ref)|stelem\.?(?:i[1248]?|r[48]|ref)?|stind\.(?:i[1248]?|r[48]|ref)?|end(?:fault|filter|finally)|ldarg(?:\.[0-3s]|a(?:\.s)?)?|ldloc(?:\.[0-9]+|\.s)?|sub(?:\.ovf(?:\.un)?)?|mul(?:\.ovf(?:\.un)?)?|add(?:\.ovf(?:\.un)?)?|stloc(?:\.[0-3s])?|refany(?:type|val)|blt(?:\.un)?(?:\.s)?|ble(?:\.un)?(?:\.s)?|bgt(?:\.un)?(?:\.s)?|bge(?:\.un)?(?:\.s)?|unbox(?:\.any)?|init(?:blk|obj)|call(?:i|virt)?|brfalse(?:\.s)?|bne\.un(?:\.s)?|ldloca(?:\.s)?|brzero(?:\.s)?|brtrue(?:\.s)?|brnull(?:\.s)?|brinst(?:\.s)?|starg(?:\.s)?|leave(?:\.s)?|shr(?:\.un)?|rem(?:\.un)?|div(?:\.un)?|clt(?:\.un)?|alignment|ldvirtftn|castclass|beq(?:\.s)?|mkrefany|localloc|ckfinite|rethrow|ldtoken|ldsflda|cgt\.un|arglist|switch|stsfld|sizeof|newobj|newarr|ldsfld|ldnull|ldflda|isinst|throw|stobj|stloc|stfld|ldstr|ldobj|ldlen|ldftn|ldfld|cpobj|cpblk|break|br\.s|xor|shl|ret|pop|not|nop|neg|jmp|dup|clt|cgt|ceq|box|and|or|br)\b/,
+
 	'boolean': /\b(?:true|false)\b/,
 	'number': /\b-?(?:0x[0-9a-fA-F]+|[0-9]+)(?:\.[0-9a-fA-F]+)?\b/i,
-	
+
 	'punctuation': /[{}[\];(),:=]|IL_[0-9A-Za-z]+/
 }

components/prism-elm.js

@@ -19,7 +19,7 @@ Prism.languages.elm = {
 		// The imported or hidden names are not included in this import
 		// statement. This is because we want to highlight those exactly like
 		// we do for the names in the program.
-		pattern: /^\s*import\s+[A-Z]\w*(?:\.[A-Z]\w*)*(?:\s+as\s+([A-Z]\w*)(?:\.[A-Z]\w*)*)?(?:\s+exposing\s+)?/m,
+		pattern: /^\s*import\s+[A-Z]\w*(?:\.[A-Z]\w*)*(?:\s+as\s+(?:[A-Z]\w*)(?:\.[A-Z]\w*)*)?(?:\s+exposing\s+)?/m,
 		inside: {
 			keyword: /\b(?:import|as|exposing)\b/
 		}

components/prism-fsharp.js

@@ -21,7 +21,7 @@ Prism.languages.fsharp = Prism.languages.extend('clike', {
 			'punctuation': /\./
 		}
 	},
-	'keyword': /\b(?:let|return|use|yield)(?:!\B|\b)|\b(abstract|and|as|assert|base|begin|class|default|delegate|do|done|downcast|downto|elif|else|end|exception|extern|false|finally|for|fun|function|global|if|in|inherit|inline|interface|internal|lazy|match|member|module|mutable|namespace|new|not|null|of|open|or|override|private|public|rec|select|static|struct|then|to|true|try|type|upcast|val|void|when|while|with|asr|land|lor|lsl|lsr|lxor|mod|sig|atomic|break|checked|component|const|constraint|constructor|continue|eager|event|external|fixed|functor|include|method|mixin|object|parallel|process|protected|pure|sealed|tailcall|trait|virtual|volatile)\b/,
+	'keyword': /\b(?:let|return|use|yield)(?:!\B|\b)|\b(?:abstract|and|as|assert|base|begin|class|default|delegate|do|done|downcast|downto|elif|else|end|exception|extern|false|finally|for|fun|function|global|if|in|inherit|inline|interface|internal|lazy|match|member|module|mutable|namespace|new|not|null|of|open|or|override|private|public|rec|select|static|struct|then|to|true|try|type|upcast|val|void|when|while|with|asr|land|lor|lsl|lsr|lxor|mod|sig|atomic|break|checked|component|const|constraint|constructor|continue|eager|event|external|fixed|functor|include|method|mixin|object|parallel|process|protected|pure|sealed|tailcall|trait|virtual|volatile)\b/,
 	'number': [
 		/\b0x[\da-fA-F]+(?:un|lf|LF)?\b/,
 		/\b0b[01]+(?:y|uy)?\b/,