Test Text with a RegExp
Parse complex strings using regular expressions. Toggle between full-input or line-by-line validation. Map patterns and copy status results [UTF-8].
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Regexp Pattern
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Error: Unable to test the text with this regular expression.
Please configure parameters and execute the action.
About Test Text with a RegExp
Test Text with a RegExp checks whether the input text matches a regular expression. It can test the full text at once or evaluate each line separately, which is useful for log reviews, code checks, IDs, labels, and validation rules.
How It Works
Use the tool in three simple steps:
- Paste text - Add the text that you want to validate or inspect.
- Enter a regexp - Type a regular expression pattern with or without slash delimiters and flags.
- Run the test - Click Test RegExp to see whether the text or each line matches.
Basic Examples
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Test the whole text
Input: Room 203 is ready. Regexp pattern: /Room\s\d+/ Line-by-line Mode: Off Output: Match found
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Test each line separately
Input: Room 203 Room A5 Hall 10 Regexp pattern: /^Room\s\d+$/ Line-by-line Mode: On Output: Line 1: Match found Line 2: No match Line 3: No match
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Use a plain pattern without slashes
Input: hello@example.com Regexp pattern: [A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,} Line-by-line Mode: Off Output: Match found
Real-World Usage Scenarios
- Log-File-Diagnostics - Filter massive system logs by isolating specific error codes, IP addresses, or timestamps using line-by-line matching.
- Bulk-Data-Sanitization - Validate large lists of inputs such as email addresses, phone numbers, or product SKUs against strict patterns before database migration.
- Configuration-Auditing - Verify the syntax of .env files, .htaccess rules, or Nginx configurations to detect formatting errors before deployment.
- Identity-Validation-Testing - Test patterns for regional identifiers like French SIRET codes, German Steuernummer, or global IBAN formats.
Frequently Asked Questions
Does the tool require slash delimiters?
No. You can enter a raw pattern like \d+ or a delimited pattern with optional flags like /[a-z]/i.
When should I use Line-by-line mode?
Enable this mode when processing logs or lists where each line represents a distinct entry that requires its own validation result.
How are regex flags handled?
If you provide a pattern using the /pattern/flags syntax, the tool automatically parses and applies flags like case-insensitivity (i) or multiline (m).
Can I test complex multi-line strings?
Yes. Disable line-by-line mode to treat the entire input as a single string, allowing you to test patterns that span multiple lines.
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