What is a regular expression?

A regular expression (regex) is a sequence of characters that define a search pattern, used for matching and manipulating text.

Why use a regex tester?

A regex tester helps you validate and debug your regex patterns to ensure they match the intended text accurately.

What are regex flags?

Regex flags modify the behavior of the regex pattern, such as enabling global matching, case-insensitive matching, or multiline mode.

Regex Tester

Test your regular expressions with our online Regex Tester.

Pattern

Test string

g(global)i(ignore case)m(multiline)

How to Use This Tool

Enter your regular expression pattern in the 'Regex Pattern' field.
Select the desired flags (e.g., 'g' for global, 'i' for case-insensitive).
Enter the text you want to test in the 'Test String' field.
The tool will highlight the matches in real-time.

Learn More About Regex Tester

Understanding Regular Expressions

Regular expressions (regex) are sequences of characters that define a search pattern. They are used for pattern matching and text manipulation in various programming languages and tools.

Common Regex Flags

g (Global): Finds all matches instead of stopping after the first.
i (Case-Insensitive): Ignores case differences when matching.
m (Multiline): Enables multiline mode, allowing '^' and '$' to match the start and end of each line.
s (Dotall): Allows the dot '.' to match newline characters.

About

Test your regular expressions with our online Regex Tester. Quickly validate patterns, flags, and test strings in real-time to ensure accurate and efficient matching.

Use Cases

Validating regular expressions for data extraction.
Testing regex patterns for text processing.
Ensuring accurate matching and replacement in code.
Debugging regular expressions for web development and scripting.

Frequently Asked Questions