Named Group Tester | Online Free Tool | Elysia Tools

Named Group Tester | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Development
Input types: textarea, text, checkbox, number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Named Group Tester is a web-based utility for parsing and extracting named capture groups from regular expressions. It supports ES2018 syntax, allowing you to test patterns against input text and view matches with named groups for efficient data extraction and validation.

When to use

When extracting specific fields from structured text like dates, URLs, or coordinates.
When parsing log files or text data to capture named segments for analysis.
When developing or debugging regex patterns that use named capture groups.

How it works

1Enter your regex pattern with named groups using the (?<name>...) syntax.
2Input the text to test, with an option for batch mode to process multiple lines.
3Configure regex flags and set a maximum results limit as needed.
4View extracted matches and named groups in a table or export to JSON/CSV.

Use cases

Extracting and validating dates from text using patterns like (?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2}).
Parsing server logs to capture timestamps, log levels, and messages with named groups.
Testing complex regex patterns with named groups before deploying them in production code.

Examples

1. Extracting Dates from Text

Data Analyst

Background

You have a dataset with date strings in YYYY-MM-DD format that need to be parsed into components.

Problem

Manually splitting date strings is inefficient and prone to errors.

How to use

Enter the regex pattern (?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2}) and paste the date strings into the text input.

Pattern: (?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2}), Flags: g

Outcome

Each date is parsed into named groups year, month, and day, displayed in a table for easy review or export.

2. Batch Processing Log Entries

System Administrator

Background

Server logs contain unstructured entries with timestamps, severity levels, and messages.

Problem

Extracting structured data from log lines manually is time-consuming and error-prone.

How to use

Enable batch mode, paste multiple log lines, and use a regex pattern to capture named groups for timestamp, level, and message.

FAQ

What is a named capture group in regex?

A named capture group is a part of a regex pattern that captures matched text and assigns it a name, using the syntax (?<name>...).

How do I test a regex pattern with this tool?

Enter your pattern with named groups, input the text, and click to see all matches with their named group values displayed.

Can I process multiple test strings at once?

Yes, enable batch mode to test each line of input as a separate string for batch processing.

What output formats are available?

Results can be viewed in an organized table or exported to JSON or CSV format for further use.

Is there a limit on the number of matches?

You can set a maximum results limit, defaulting to 100, to control the output size and performance.

Pattern: (?<timestamp>\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) (?<level>\w+) (?<message>.*), Batch Mode: true