Function safeRegexTest

packages/agentflow/src/core/utils/fieldVisibility.ts:50–58

* Safe regex test: rejects patterns that are oversized, contain nested quantifiers * (the primary cause of catastrophic backtracking), or are syntactically invalid.

(pattern: string, value: string)

 * (the primary cause of catastrophic backtracking), or are syntactically invalid.
 */
function safeRegexTest(pattern: string, value: string): boolean {
    if (pattern.length > MAX_REGEX_LENGTH) return false
    if (hasNestedQuantifier(pattern)) return false
    try {
        return new RegExp(pattern).test(value)
    } catch {
        return false
    }
}

/**
 * Check if a ground value matches a comparison value using the same matrix