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Fix #4775: Escape user code before incorporating in a regex #236809

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Fix #4775: Escape user code before incorporating in a regex #236809

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4 changes: 3 additions & 1 deletion src/vs/editor/standalone/common/monarch/monarchCommon.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -183,7 +183,7 @@ export function substituteMatches(lexer: ILexerMin, str: string, id: string, mat
export function substituteMatchesRe(lexer: ILexerMin, str: string, state: string): string {
const re = /\$[sS](\d\d?)/g;
let stateMatches: string[] | null = null;
return str.replace(re, function (full, s) {
str = str.replace(re, function (full, s) {
if (stateMatches === null) { // split state on demand
stateMatches = state.split('.');
stateMatches.unshift(state);
Expand All @@ -193,6 +193,8 @@ export function substituteMatchesRe(lexer: ILexerMin, str: string, state: string
}
return '';
});

return str.replace(/[/\-\\^$*+?.()|[\]{}]/g, '\\$&');
}

/**
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