Optimize String concatenation in TestFolderPathPattern loops

This commit replaces inefficient string concatenations and `replaceFirst` inside loops with optimized `StringBuilder` and `Matcher.appendReplacement` strategies.
This addresses performance bottlenecks when repeatedly updating `result` within `resolveGroups` and parsing large template strings in `replaceGroupsWithRefs`.

Co-authored-by: RoiSoleil <3462260+RoiSoleil@users.noreply.github.com>

Author: google-labs-jules[bot]

org.moreunit.core/src/org/moreunit/core/matching/TestFolderPathPattern.java

@@ -48,6 +48,8 @@ public class TestFolderPathPattern
         TEST_PATH_VALIDATOR = compile("^/?[^/\\*\\(\\)]*" + quote(SRC_PROJECT_VARIABLE) + "[^\\*\\(\\)]*$");
     }
 
+    private static final Pattern GROUP_PATTERN = Pattern.compile("\\([^\\)]+\\)");
+
     private final String srcPathTemplate;
     private final String testPathTemplate;
     private final Pattern testProjectPattern;
@@ -204,6 +206,7 @@ private String resolveGroups(String path, String tplWithGroups, String tplWithRe
             List<GroupRef> groupRefs = getGroupRefs(result);
             reverse(groupRefs);
 
+            StringBuilder resultBuilder = new StringBuilder(result);
             for (int i = 0; i < groupRefs.size(); i++)
             {
                 GroupRef ref = groupRefs.get(i);
@@ -218,8 +221,9 @@ private String resolveGroups(String path, String tplWithGroups, String tplWithRe
                     throw new DoesNotMatchConfigurationException(analizedPath);
                 }
 
-                result = result.substring(0, ref.startIdx) + groupContent + result.substring(ref.endIdx);
+                resultBuilder.replace(ref.startIdx, ref.endIdx, groupContent);
             }
+            result = resultBuilder.toString();
         }
         return result;
     }
@@ -251,6 +255,11 @@ public SourceFolderPath getSrcPathFor(Path testPath) throws DoesNotMatchConfigur
 
     private String replaceGroupsWithRefs(String template, List<GroupRef> groupRefs)
     {
+        if (groupRefs.isEmpty())
+        {
+            return template;
+        }
+
         Map<Integer, Integer> refIndices = new HashMap<Integer, Integer>();
         int idx = 1;
         for (GroupRef ref : groupRefs)
@@ -259,12 +268,16 @@ private String replaceGroupsWithRefs(String template, List<GroupRef> groupRefs)
             idx++;
         }
 
-        String result = template;
-        for (int i = 0; i < groupRefs.size(); i++)
+        Matcher matcher = GROUP_PATTERN.matcher(template);
+        StringBuffer sb = new StringBuffer();
+        int i = 0;
+        while (matcher.find() && i < groupRefs.size())
         {
-            result = result.replaceFirst("\\([^\\)]+\\)", "\\\\" + refIndices.get(i));
+            matcher.appendReplacement(sb, Matcher.quoteReplacement("\\" + refIndices.get(i)));
+            i++;
         }
-        return result;
+        matcher.appendTail(sb);
+        return sb.toString();
     }
 
     private String getSrcProjectName(String tstProjectName, Path tstPath) throws DoesNotMatchConfigurationException