Extract regex pattern to avoid recompilation in loop

[sonarqube-agent]

This PR was automatically created by the Remediation Agent's Scheduled backlog remediation feature.

Why these issues? MAJOR severity issue with a clear, actionable rule (S9142) that eliminates redundant regex compilation in loops for immediate performance improvement. The single-file scope makes this change straightforward and automatable while delivering tangible benefits to runtime efficiency.

Fixed a MAJOR SonarQube issue where a regular expression pattern was being compiled repeatedly inside a loop in ComplexityVisitor.java. By extracting the pattern to a pre-compiled Pattern constant, this change improves performance by eliminating redundant regex compilation and follows Java best practices for pattern reuse.

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Fixed Issues

java:S9142 - Extract this regular expression to a Pattern compiled outside the loop. • MAJOR • View issue

Location: sonar-html-plugin/src/main/java/org/sonar/plugins/html/analyzers/ComplexityVisitor.java:55

Why is this an issue?

Compilation and preparation operations are expensive because they involve parsing, validation, and internal representation building. When these operations are performed inside loops with constant or loop-invariant arguments, the same work is repeated unnecessarily on every iteration.

What changed

Adds the import for java.util.regex.Pattern, which is needed to define the pre-compiled Pattern constant. This supports fixing the issue where a regular expression pattern used in String.split() was being compiled repeatedly inside a loop at line 55 of ComplexityVisitor.java.

--- a/sonar-html-plugin/src/main/java/org/sonar/plugins/html/analyzers/ComplexityVisitor.java
+++ b/sonar-html-plugin/src/main/java/org/sonar/plugins/html/analyzers/ComplexityVisitor.java
@@ -20,0 +21,1 @@ import java.util.Set;
+import java.util.regex.Pattern;

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