Regex Tester

Test patterns with live matches.

Input Parameters

Pattern

Flags

Test text

Calculation Summary

Matches2

Valid regex✓

“ada@example.com” @ 8

“bob@test.org” @ 27

175 available

Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.

Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.

Visualize compound growth with recurring deposits, annual rate, and investment horizons.

Add or extract Value Added Tax (VAT) with international country presets.

Analyze profitability and percentage return on business capital and investments.

Gross to net salary with income tax, social contributions and deductions, monthly and annual.

About this calculator

Test JavaScript regular expressions live: validity, match count and indexed matches.

Flags?

g/i/m/s/u/y supported; scanning forces global.

Catastrophic patterns?

Kept safe by capping text at 5000 chars and 100 matches.

Groups shown?

Full matches with indices; use (...) and test to explore groups.