Have HTML5’s a inputs pattern attribute ignore case

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I don’t think it is possible.

  1. The specification on <input pattern> [1,2] specifies that

    • the pattern uses the ECMAScript (i.e. Javascript) flavor of regex

    • it is compiled “with the global, ignoreCase, and multiline flags disabled“

  2. In Javascript, the only way to make a regex ignore case is to set the modifier externally (/.../i). The PCRE syntax (?i) is not supported.

Therefore, the pattern is always case-sensitive and [a-zA-Z]* (i.e. making the regex itself explicitly case insensitive) is the only way to match the pattern in a case-insensitive way.

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