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Docs on iOS's directional quote characters (#132869)

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When you type a single or double quote character on the default iOS keyboard, it doesn't actually insert the usual `'` or `"`.  Instead, it inserts a directional version that tries to match with others.  This is very tricky when allow/deny-listing characters, so I've added a section about this to the docs.

Fixes https://github.com/flutter/flutter/issues/132232
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Justin McCandless 2023-08-21 12:02:33 -07:00 committed by GitHub
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packages/flutter/lib/src/services/text_formatter.dart
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@ -251,6 +251,14 @@ class _TextEditingValueAccumulator {
/// As an example, [FilteringTextInputFormatter] typically shouldn't be used
/// with [RegExp]s that contain positional matchers (`^` or `$`) since these
/// patterns are usually meant for matching the whole string.
///
/// ### Quote characters on iOS
///
/// When filtering single (`'`) or double (`"`) quote characters, be aware that
/// the default iOS keyboard actually inserts special directional versions of
/// these characters (`‘` and `’` for single quote, and `“` and `”` for double
/// quote). Consider including all three variants in your regular expressions to
/// support iOS.
class FilteringTextInputFormatter extends TextInputFormatter {
/// Creates a formatter that replaces banned patterns with the given
/// [replacementString].