FIxed some cases of quadratic worst-case runtime (#2922)

Author: RunDevelopment

components/prism-abnf.js

@@ -25,7 +25,7 @@
 			alias: 'operator'
 		},
 		'definition': {
-			pattern: /(^[ \t]*)(?:[a-z][\w-]*|<[^>\r\n]*>)(?=\s*=)/m,
+			pattern: /(^[ \t]*)(?:[a-z][\w-]*|<[^<>\r\n]*>)(?=\s*=)/m,
 			lookbehind: true,
 			alias: 'keyword',
 			inside: {
@@ -41,7 +41,7 @@
 			}
 		},
 		'rule': {
-			pattern: /(^|[^<\w-])[a-z][\w-]*|<[^>\r\n]*>/i,
+			pattern: /(^|[^<\w-])[a-z][\w-]*|<[^<>\r\n]*>/i,
 			lookbehind: true,
 			inside: {
 				'punctuation': /<|>/