== Why is this an issue?

include::../description.adoc[]


=== Noncompliant code example

[source,php]
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"/a++abc/"              // Noncompliant, the second 'a' never matches
"/\d*+[02468]/"         // Noncompliant, the sub-pattern "[02468]" never matches
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=== Compliant solution

[source,php]
----
"/aa++bc/"              // Compliant, for example it can match "aaaabc"
"/\d*+(?<=[02468])/"    // Compliant, for example it can match an even number like "1234"
----