symfony/http-kernel · error · LogicException

Invalid regular expression in the "$

Error message

Invalid regular expression in the "$%s" argument of "%s": "%s".

What it means

ProfilerListener builds a combined regex from configured path/exception exclusion patterns and validates it with preg_match at construction. If the assembled pattern is not a valid PCRE, a LogicException is thrown listing the offending patterns.

Solutions

1. Fix the configured pattern so it is a valid delimited PCRE, e.g. '^/api/' instead of '/api/'.
2. Validate each regex with @preg_match() in a config test or lint before deployment.
3. Use plain prefixes or a dedicated matcher option if regex escaping is error-prone.

Example fix

// before (config)
profiler: { excluded_urls: '^/health$' }
// after
profiler: { excluded_urls: '#^/health$#' }

foreach ($patterns as $p) { if (@preg_match('#^'.str_replace('#','\#',$p).'#', '') === false) { throw new \InvalidArgumentException("Invalid regex: $p"); } }

try { $listener = new ProfilerListener(...); } catch (\LogicException $e) { /* log and surface the bad config key to the user */ throw new \RuntimeException($e->getMessage(), 0, $e); }

When it happens

Trigger: Constructing ProfilerListener with invalid regexes in the 'path_only'/'excluded-urls' style option arrays, e.g. an unbalanced delimiter or invalid modifier in a framework.profiler setting or manual new ProfilerListener(...) call.

Common situations: Typo in symfony/profiler excluded_urls config (missing delimiters like '#' or '/'); copying a pattern from another tool with unsupported syntax; concatenating user config into regexes.

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AI-assisted analysis of symfony/http-kernel@aa3a39d728 (2026-09-13). Data as JSON: /api/errors/c2cefcaab09ff7ce. Report an issue: GitHub.

Appendix: source

Thrown at EventListener/ProfilerListener.php:202

        if (!\array_key_exists($code = $response->getStatusCode(), $this->excludedHttpCodePatterns)) {
            return false;
        }

        $pattern = $this->excludedHttpCodePatterns[$code];

        return null === $pattern || preg_match($pattern, $pathInfo);
    }

    /**
     * @param list<string> $regexps
     */
    private static function compilePattern(array $regexps, string $argument): string
    {
        $pattern = '{('.implode('|', $regexps).')}';

        if (false === @preg_match($pattern, '')) {
            throw new \LogicException(\sprintf('Invalid regular expression in the "$%s" argument of "%s": "%s".', $argument, self::class, implode('", "', $regexps)));
        }

        return $pattern;
    }
}

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