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CLDR-17467 kbd: disallow empty match #3585

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Apr 2, 2024
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CLDR-17467 kbd: disallow empty match #3585

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4 changes: 4 additions & 0 deletions docs/ldml/tr35-keyboards.md
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Expand Up @@ -2300,6 +2300,10 @@ The following are additions to standard Regex syntax.

#### Disallowed Regex Features

- **Matching an empty string**

Transforms may not match an empty string. For example, `<transform from=""/>` or `<transform from="X{0,1}"/>` are not allowed and must be flagged as an error to keyboard authors.

- **Unicode properties**

`\p{property}` `\P{property}`
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