39 lines
797 B
Plaintext
39 lines
797 B
Plaintext
include::../description.adoc[]
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== Noncompliant Code Example
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----
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preg_match("/Jack|Peter|/", "John"); // Noncompliant - returns 1
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preg_match("/Jack||Peter/", "John"); // Noncompliant - returns 1
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----
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== Compliant Solution
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----
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preg_match("/Jack|Peter/", "John"); // returns 0
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----
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== Exceptions
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One could use an empty alternation to make a regular expression group optional. Rule will not report on such cases.
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----
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preg_match("/mandatory(-optional|)/", "mandatory"); // returns 1
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preg_match("/mandatory(-optional|)/", "mandatory-optional"); // returns 1
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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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== Message
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Remove this empty alternative.
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== Highlighting
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The | should be highlighted.
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'''
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endif::env-github,rspecator-view[]
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