Extract IDs
Pattern: id=(\d+) | Text: id=42 id=73
Matches 42 and 73 with one capture group each.
Text Tools
Regex Tester
Test regular expressions against sample text with flags and match details.
At a glance: This regex tester runs JavaScript regular expressions locally in your browser and lists matches with indexes and captured groups. It is useful for validating extraction patterns, search expressions, and quick data-cleanup rules without sending text elsewhere.
Your input is processed locally in your browser and is not uploaded to ByteBench servers.
Quick reference
\d digit\w word character. any character except line break+ one or more() capture groupLoading browser tool.
How to use this tool
- Paste or type your input into the tool area.
- Choose the mode or options that match your task.
- Review validation messages before copying the output.
- Use the example button when you want a known-good starting point.
Examples
Common use cases
- Check a log parsing pattern.
- Inspect capture groups before using a regex in code.
- Test global and case-insensitive flags.
When to use this tool
Use this regex tester page when you need to test regular expressions against sample text quickly during debugging, review, migration, or documentation work and want to keep raw input in your browser session.
If your task shifts, Case Converter and Text Diff Checker are usually the next useful tools.
Input and output expectations
- Expected input shape: Paste raw text exactly as you need to compare, normalize, or transform it.
- Typical output: Cleaned or transformed text that is easier to diff, reuse, or document.
- Quick input example: Pattern: id=(\d+) | Text: id=42 id=73
- Quick output example: Matches 42 and 73 with one capture group each.
Common mistakes to avoid
- Cleaning text before preserving the original source for comparison.
- Applying the wrong mode for casing or whitespace behavior.
- Assuming transformed text keeps every visual formatting detail.
Notes and edge cases
Very broad or nested patterns can be slow on large text. If matching feels sluggish, reduce the sample size or simplify the expression.
For privacy-sensitive data, keep using the tool in a trusted browser session and avoid pasting secrets into shared screens, screenshots, browser extensions, or remote support sessions.
FAQ
Does this regex tester upload my input?
No. This regex tester runs in your browser and does not send your input to ByteBench servers.
What input format works best in this regex tester?
Use clean JavaScript regular expression syntax input and run the example first when you want a known-good baseline. If your pasted data came from logs or docs, remove accidental wrappers before validating or converting.
How should I validate results from this regex tester?
Review the status message, compare output with expected behavior, and run one quick edge-case check. ByteBench helps with utility work, but production-critical output should still be verified in your project pipeline.