Java Stack Trace Frame Regex for Go

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching java stack trace frame, ported and verified for Go. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.

Go Implementation

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

package validation

import "regexp"

var javaStackTraceFrameRe = regexp.MustCompile(`^\s+at ([a-zA-Z_$][a-zA-Z0-9_$]*(?:\.[a-zA-Z_$][a-zA-Z0-9_$]*)+)\.([a-zA-Z_$<>][a-zA-Z0-9_$<>]*)\(([a-zA-Z_$][a-zA-Z0-9_$]*\.java|Native Method|Unknown Source)(?::([0-9]+))?\)$`)

func ValidateJavaStackTraceFrame(s string) bool {
    return javaStackTraceFrameRe.MatchString(s)
}

// Example
// fmt.Println(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 Go developers because Go's RE2 engine is inherently safe from catastrophic backtracking, but this pattern has been additionally verified for correctness. 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.