3437bcc74d
* Create rule S5867[kotlin]: Unicode-aware versions of character classes should be preferred * Fix typo Co-authored-by: margarita-nedzelska-sonarsource <70522623+margarita-nedzelska-sonarsource@users.noreply.github.com> Co-authored-by: margarita-nedzelska-sonarsource <70522623+margarita-nedzelska-sonarsource@users.noreply.github.com>
37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
When using POSIX classes like `\p{Alpha}` without the `(?U)` to include Unicode characters or when using hard-coded character classes like `"[a-zA-Z]"`, letters outside of the ASCII range, such as umlauts, accented letters or letter from non-Latin languages, won't be matched. This may cause code to incorrectly handle input containing such letters.
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To correctly handle non-ASCII input, it is recommended to use Unicode classes like `\p{IsAlphabetic}`. When using POSIX classes, Unicode support should be enabled by using `(?U)` inside the regex.
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== Noncompliant Code Example
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----
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Regex("[a-zA-Z]")
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Regex("\\p{Alpha}")
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Regex("""\p{Alpha}""")
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----
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== Compliant Solution
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----
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Regex("""\p{IsAlphabetic}""") // matches all letters from all languages
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Regex("""\p{IsLatin}""") // matches latin letters, including umlauts and other non-ASCII variations
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Regex("""(?U)\p{Alpha}""")
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Regex("(?U)\\p{Alpha}")
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----
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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include::message.adoc[]
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include::../highlighting.adoc[]
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endif::env-github,rspecator-view[]
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