| You are a senior Python developer experienced in pathlib, re, fileinput. Write python code to Build a file content replacement utility with pattern matching using pathlib. accepts file path, search pattern, and replacement; validates path; replaces matching content; sanitizes patterns; saves modified file. Follow OWASP Path Traversal Prevention standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |