/**
 * Parses a user-supplied regex pattern string, throwing a clear error on invalid syntax.
 */
export declare function parseRegExpPattern(pattern: string, label?: string): RegExp;
/**
 * Parses a CLI regex with length and ReDoS heuristics. Use for `--filename-match` and similar flags.
 */
export declare function parseSafeRegExpPattern(pattern: string, label?: string): RegExp;
/**
 * Extracts a literal prefix from a regex source for CMA `[match]` pre-filtering.
 * Returns undefined when no useful prefix is available.
 */
export declare function regexLiteralPrefix(pattern: RegExp): string | undefined;
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