Regular expression online tool instructions

Function Overview
This tool is designed for developers to provide a library of validated regular expression templates, covering high-frequency needs such as number extraction, email verification, URL matching, etc. All expressions are marked with the applicable language environment (e.g. JavaScript needs to be added). All expressions are marked with the applicable language environment ( such as JavaScript need to add the/ delimiters), support for quick testing and modification.

Core Functions

- Number Processing： Integer/float matching, thousands separator recognition, scientific notation parsing.
- Format validation： Standardised validation rules for emails, mobile phone numbers, ID numbers, etc.
- Text Extraction： HTML tag filtering, keyword positioning, multi-criteria combination matching.

How to use

1. Select the target scenario (e.g. "Number Matching") from the category list.
2. Copy the corresponding expression to your code editor.
3. Adjust the delimiters or escape characters according to the language characteristics.
4. Verify the validity of the expression with the built-in test box. Adaptation Notes： Different programming languages have different implementations of regular (e.g. greedy mode default behaviour), the tool has marked the main environments for each template. When encountering boundary cases, you can refer to the accompanying Debugging Tips module for optimisation. The tool is constantly updated with industry standard rules (e.g., the latest phone number rules) and accepts user-submitted expression templates to build a community of developers.