Java Stack Trace Frame Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching java stack trace frame, ported and verified for JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// Java Stack Trace Frame
// ReDoS-safe | RegexVault — Dev & Systems > Log Parsing

const javaStackTraceFrameRegex = /^\s+at ([a-zA-Z_$][a-zA-Z0-9_$]*(?:\.[a-zA-Z_$][a-zA-Z0-9_$]*)+)\.([a-zA-Z_$<>][a-zA-Z0-9_$<>]*)\(([a-zA-Z_$][a-zA-Z0-9_$]*\.java|Native Method|Unknown Source)(?::([0-9]+))?\)$/;

function validateJavaStackTraceFrame(input: string): boolean {
  return javaStackTraceFrameRegex.test(input);
}

// Example
console.log(validateJavaStackTraceFrame("	at com.example.MyClass.myMethod(MyClass.java:42)")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > Log Parsing category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. 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=FQCN, 2=method name, 3=source file or 'Native Method'/'Unknown Source', 4=line number. Leading whitespace is required. <init> and <clinit> are valid method names.