include::../description.adoc[]


== Noncompliant Code Example

[source,php]
----
/^a|b|c$/
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== Compliant Solution

[source,php]
----
/^(?:a|b|c)$/
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or


[source,php]
----
/^a$|^b$|^c$/
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or, if you do want the anchors to only apply to ``++a++`` and ``++c++`` respectively:


[source,php]
----
/(?:^a)|b|(?:c$)/
----