Fix 100% cpu crash due to regex in terminal link code

Fixes #24795

src/vs/workbench/parts/terminal/electron-browser/terminalLinkHandler.ts

@@ -18,7 +18,9 @@ import { IConfigurationService } from 'vs/platform/configuration/common/configur
 
 const pathPrefix = '(\\.\\.?|\\~)';
 const pathSeparatorClause = '\\/';
-const excludedPathCharactersClause = '[^\\0\\s!$`&*()\\[\\]+\'":;]'; // '":; are allowed in paths but they are often separators so ignore them
+// '":; are allowed in paths but they are often separators so ignore them
+// Also disallow \\ to prevent a catastropic backtracking case #24798
+const excludedPathCharactersClause = '[^\\0\\s!$`&*()\\[\\]+\'":;\\\\]';
 const escapedExcludedPathCharactersClause = '(\\\\s|\\\\!|\\\\$|\\\\`|\\\\&|\\\\*|(|)|\\+)';
 /** A regex that matches paths in the form /foo, ~/foo, ./foo, ../foo, foo/bar */
 const unixLocalLinkClause = '((' + pathPrefix + '|(' + excludedPathCharactersClause + '|' + escapedExcludedPathCharactersClause + ')+)?(' + pathSeparatorClause + '(' + excludedPathCharactersClause + '|' + escapedExcludedPathCharactersClause + ')+)+)';