Regexer is a Python Regex pattern generator.

Curious? Try it now here!

How it works

Under the hood, it uses LLM (OpenAI or Anthropic) to generate a Regex pattern based on a given example.

1. Input: Accepts a CSV string with only 2 headers, base_string and search_string. Where base_string contains the string where search_string must be extracted from.

2. CSV Validator: LLM will validate if the given CSV string follows the correct format. Instructions will be provided if input fails the validation.

3. LLM will create a Regex pattern based on the input CSV

4. Regex Validator: validates the Regex pattern by comparing its output against search_string. If for each row the Regex pattern correctly outputs the search_string. The program will terminate and the pattern will be displayed.

5. If Regex Validator fails, LLM will retry max_retries number of times until Regex Validator is passed. If max_retries is exhausted, the last pattern will be displayed.

Example

Use the CSV string below as an example.

base_string,search_string
"https://docs.google.com/spreadsheets/d/aabc-d12/edit#gid=0","aabc-d12"
"https://docs.google.com/spreadsheets/d/33_eed/33_eed","33_eed"