Scientific numbers

Decimals with optional exponent notation.

Pattern

/[-+]?(?:\d+\.\d*|\.\d+|\d+)(?:[eE][-+]?\d+)?/

1.23e-4
-0.5
42
.25
not-a-number

Capture local and domain parts from common email shapes.

Match HH:MM or HH:MM:SS clock times.

kebab-case slugs for routes and CMS paths.

Standard 8-4-4-4-12 hex UUID layout.

Stricter UUID version 4 with variant bits.

5-digit ZIP or ZIP+4.