Description & Learning Section

Regular expressions (regex) are powerful patterns used to match, search, and manipulate strings across nearly all programming languages. But writing them from scratch can be tricky — especially for beginners.

This tool helps you build regex patterns step-by-step by choosing what your string should start with, contain, or end with. It automatically generates the regex string and gives you a human-readable explanation for each part.

Common Use Cases:

• Validate inputs like emails, numbers, and usernames
• Find strings that match certain prefixes/suffixes
• Build filters for logs, config files, or scraped data

Example:

Input:

• Starts with: abc
• Contains: 123
• Ends with: xyz

Generated Regex:

^abc.*123.*xyz$

This pattern matches strings that start with abc, contain 123 somewhere in the middle, and end with xyz.

Need more power? Use this alongside the Regex Tester to validate and debug your generated pattern.