== Why is this an issue?

include::../description.adoc[]

=== Noncompliant code example

[source,java]
----
str.matches("[0-99]") // Noncompliant, this won't actually match strings with two digits
str.matches("[0-9.-_]") // Noncompliant, .-_ is a range that already contains 0-9 (as well as various other characters such as capital letters)
----


=== Compliant solution

[source,java]
----
str.matches("[0-9]{1,2}")
str.matches("[0-9.\\-_]")
----

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

include::../highlighting.adoc[]

endif::env-github,rspecator-view[]