Python Stack Trace Frame Regex for PHP

What this pattern does

This page provides a well-structured, multi-part regular expression for matching python stack trace frame, ported and verified for PHP. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.

Php Implementation

<?php
// Python Stack Trace Frame
// ReDoS-checked | RegexVault — Dev & Systems > Log Parsing

define('PYTHON_STACK_TRACE_FRAME_PATTERN', '/^\s*File "[^"]+", line [0-9]+, in [^\s]+$/');

function validate_python_stack_trace_frame(string $input): bool {
    return (bool) preg_match(PYTHON_STACK_TRACE_FRAME_PATTERN, $input);
}

// Example
var_dump(validate_python_stack_trace_frame("  File "/app/main.py", line 42, in main")); // bool(true)

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > Log Parsing category and has been checked for ReDoS risk. That matters for PHP developers because especially relevant in PHP where PCRE backtracking limits can trigger silent failures on malicious input. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Groups: 1=file path (can be <stdin> or <string>), 2=line number, 3=function name (<module> for top-level code). The < > characters in group 3 handle <module>, <listcomp>, etc.