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>
36 lines
1.3 KiB
Plaintext
36 lines
1.3 KiB
Plaintext
When using POSIX classes like ``++\p{Alpha}++`` without the ``++UNICODE_CHARACTER_CLASS++`` flag 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 either passing ``++Pattern.UNICODE_CHARACTER_CLASS++`` as a flag to ``++Pattern.compile++`` or by using ``++(?U)++`` inside the regex.
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== Noncompliant Code Example
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----
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Pattern.compile("[a-zA-Z]");
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Pattern.compile("\\p{Alpha}");
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----
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== Compliant Solution
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----
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Pattern.compile("\\p{IsAlphabetic}"); // matches all letters from all languages
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Pattern.compile("\\p{IsLatin}"); // matches latin letters, including umlauts and other non-ASCII variations
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Pattern.compile("\\p{Alpha}", Pattern.UNICODE_CHARACTER_CLASS);
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Pattern.compile("(?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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