About this regex generator
Two ways to build a pattern: scene presets give you ready-made regexes for email, URL, Chinese mobile numbers, IPv4, dates, strong passwords, hex colors and QQ numbers, each with a segment-by-segment explanation (including what ^ and $ mean); the builder lets you type a body, choose start/end anchors and a quantifier (exactly n, n–m, 1+, 0+, 1?) and assembles the full regex for you.
Every result can be copied with one click. The builder joins the body as raw regex source, so \d, [a-z] and friends work as-is; multi-character bodies get wrapped in a (?:…) non-capturing group before the quantifier, and the assembled pattern is compile-checked. Everything runs locally in your browser.