About Regex Tester & Match Extractor
Define your own regular expression (regex) to search the input data with, optionally choosing from a list of pre-defined patterns. Supports extended regex syntax including the 'dot matches all' flag, named capture groups, full unicode coverage (including \p{} categories and scripts as well as astral codes) and recursive matching.
Input: text. Output: HTML with a sandboxed preview.
Format reference: Regular expression background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Built in regexes | "User defined" | Text14 Available choices
|
| Regex | "[0-9]+" | Text |
| Case insensitive | true | On or off |
| ^ and $ match at newlines | true | On or off |
| Dot matches all | false | On or off |
| Unicode support | false | On or off |
| Astral support | false | On or off |
| Display total | false | On or off |
| Output format | List matches | Highlight matches, List matches, List capture groups, List matches with capture groups |
Input
order-102 and order-205
Result
The result is shown in the preview; download it to inspect the generated content.
Choose the output you need
Highlight matches for inspection, or select a list output to copy matching strings and capture groups. Multiline anchors and dot-matches-all are separate switches.
Pattern engine differences
This tool supports extended JavaScript-style regular expressions through its engine. A pattern may behave differently in PCRE, Python or another runtime. Test it in the target application before deploying it.
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Built in regexes | "User defined" | Text14 Available choices
|
| Regex | "" | Text |
| Case insensitive | true | On or off |
| ^ and $ match at newlines | true | On or off |
| Dot matches all | false | On or off |
| Unicode support | false | On or off |
| Astral support | false | On or off |
| Display total | false | On or off |
| Output format | Highlight matches | Highlight matches, List matches, List capture groups, List matches with capture groups |
Before interpreting the result
Choose whether an operation works on characters, lines or bytes. Check delimiter and regular expression options before processing logs or structured text.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.