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/ Regular Expression Tester

Regular Expression Pattern

Flags

g: global, i: case insensitive, m: multiline, s: dotAll, u: unicode

Test String

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Regular Expression Tester

Test and debug regular expressions with live matching

■ 01

What are Regular Expressions?

Regular expressions (regex) are powerful pattern-matching tools used to search, validate, and manipulate text. They use a special syntax to define patterns that can match specific sequences of characters, making them es…

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How does it work?

Testing Process The regex tester evaluates your pattern against test text in real-time. It compiles your regular expression with the specified flags, then searches through the test string to find all matches. Results sh…

■ 03

Sample Cases

Covers Email pattern, Phone number, and URL so you can compare common inputs and outputs quickly.

/ Code

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/ Integration

Source code from the selected tool, shown here alongside the live version on the right.

/ Source Code

TypeScript

typescript

type RegexMatch = {
  match: string;
  index: number;
  groups: string[];
};

function testRegex(pattern: string, flags: string, testString: string): RegexMatch[] {
  try {
    const regex = new RegExp(pattern, flags);
    const globalRegex = new RegExp(pattern, flags.includes('g') ? flags : flags + 'g');