25 lines
536 B
Plaintext
25 lines
536 B
Plaintext
== Why is this an issue?
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include::../description.adoc[]
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=== Noncompliant code example
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[source,php]
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----
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"/(?:)*/" // same as the empty regex, the '*' accomplishes nothing
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"/(?:|x)*/" // same as the empty regex, the alternative has no effect
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"/(?:x|)*/" // same as 'x*', the empty alternative has no effect
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"/(?:x*|y*)*/" // same as 'x*', the first alternative would always match, y* is never tried
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"/(?:x?)*/" // same as 'x*'
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"/(?:x?)+/" // same as 'x*'
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----
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=== Compliant solution
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[source,php]
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----
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"/x*/"
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----
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