Validating forms with the HTML5 pattern attribute
summary
HTML5 lets HTML carry regex validation via the pattern attribute so forms can enforce formats without heavy JavaScript; examples include \d and [0-9] to force numeric entry and bring up iOS numeric keyboards, a four‑digit Australian postcode pattern, a two‑or‑four‑digit year, a grouped regex for 24‑hour time, and an RFC‑compliant email regex that balloons to ~6.2k characters. Browser support is inconsistent (required fails in Safari 7, date controls unreliable), so a small custom JS fallback library is often used.
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chapters (10)
- 0:00Intro
- 0:12HTML5 RECAP
- 3:06PATTERNS
- 3:39NOW YOU HAVE TWO PROBLEMS
- 4:53POSTCODE
- 5:34TIME
- 6:56EMAIL
- 8:26SECURITY
- 11:03CREDIT CARDS
- 11:50ERROR MESSAGES
