Allow YAML strings to have trailing comments (#1602)

Updates the string regex to allow for strings that may have a trailing '#'.
This uses a different pattern from other regex patterns, because only
the string regex pattern is greedy, while the others are not.

Fix #1601.

components/prism-yaml.js

@@ -31,7 +31,7 @@ Prism.languages.yaml = {
 		alias: 'important'
 	},
 	'string': {
-		pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)("|')(?:(?!\2)[^\\\r\n]|\\.)*\2(?=[ \t]*(?:$|,|]|}))/m,
+		pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)("|')(?:(?!\2)[^\\\r\n]|\\.)*\2(?=[ \t]*(?:$|,|]|}|\s*#))/m,
 		lookbehind: true,
 		greedy: true
 	},

tests/languages/yaml/string_feature.test

@@ -3,6 +3,8 @@ foo: ""
 bar: "fo\"obar"
 foo: ''
 bar: 'fo\'obar'
+foo: "foo" # bar
+bar: 'bar' # foo
 
 ----------------------------------------------------
 
@@ -15,7 +17,11 @@ bar: 'fo\'obar'
 	["key", "foo"], ["punctuation", ":"],
 	["string", "''"],
 	["key", "bar"], ["punctuation", ":"],
-	["string", "'fo\\'obar'"]
+	["string", "'fo\\'obar'"],
+	["key", "foo"], ["punctuation", ":"],
+	["string", "\"foo\""], ["comment", "# bar"],
+	["key", "bar"], ["punctuation", ":"],
+	["string", "'bar'"], ["comment", "# foo"]
 ]
 
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