Test, debug, and visualize JavaScript regular expressions in real time with group capture explanations, flags, and match highlights.
Configures pattern during client-side javascript regular expression (regex) tester & visualizer computation.
Configures flags during client-side javascript regular expression (regex) tester & visualizer computation.
Configures test string during client-side javascript regular expression (regex) tester & visualizer computation.
Configures replace pattern during client-side javascript regular expression (regex) tester & visualizer computation.
Extract protocol, hostname, port, path and query parameters with named groups
Validate and parse calendar dates with YYYY-MM-DD grouping
Match valid 0-255 octet IPv4 addresses safely
Verify that your pattern matches the expected configuration format. Load a built-in sample preset to compare structural formatting.
Check the flags setting in JavaScript Regular Expression (RegEx) Tester & Visualizer to ensure encoding, precision, or specification version matches your target runtime.
Every regular expression and test string is evaluated strictly within your browser runtime. Zero data is ever sent to servers, maintaining absolute confidentiality for API keys, logs, and sensitive payloads.
Equipped with smart execution guards, zero-width loop advancement, heuristic nested quantifier alerts, and a 250ms evaluation ceiling to keep the UI thread responsive.
Provides distinct color mapping for numbered and named capture groups, hierarchical matching indices, and live substitution preview with tokens like $1, $2, and $&.
Capture user mailbox and domain names into distinct groups
Encodez et décodez en toute sécurité des URL et paramètres de requête avec les normes RFC 3986, encodeURIComponent, encodeURI et formUrlEncoded.
Convertissez du texte et du code en entités HTML nommées, décimales et hexadécimales pour neutraliser les failles XSS et préserver les caractères spéciaux.
Référentiel du temps POSIX : conversion en secondes, millisecondes, microsecondes et nanosecondes, calculs de fuseaux et norme ISO 8601.
Visual Unix file permission calculator with numeric (755, 644) and symbolic (rwxr-xr-x) modes.
Converts arbitrary JSON structures into clean, type-safe TypeScript interfaces.
Convertissez instantanément du texte et des variables de code entre camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE et 15 conventions de nommage.