ListGroups: Add support for filtering groups by regex

Change-Id: I325937caaef973d8d213c9f03a1ac9caa0a5a764

gerrit-server/src/main/java/com/google/gerrit/server/api/groups/GroupsImpl.java

@@ -143,6 +143,7 @@ class GroupsImpl implements Groups {
     list.setLimit(req.getLimit());
     list.setStart(req.getStart());
     list.setMatchSubstring(req.getSubstring());
+    list.setMatchRegex(req.getRegex());
     list.setSuggest(req.getSuggest());
     try {
       return list.apply(tlr);

gerrit-server/src/main/java/com/google/gerrit/server/group/ListGroups.java

@@ -53,6 +53,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.TreeMap;
+import java.util.regex.Pattern;
 import org.kohsuke.args4j.Option;
 
 /** List groups visible to the calling user. */
@@ -77,6 +78,7 @@ public class ListGroups implements RestReadView<TopLevelResource> {
   private int limit;
   private int start;
   private String matchSubstring;
+  private String matchRegex;
   private String suggest;
 
   @Option(
@@ -170,6 +172,16 @@ public class ListGroups implements RestReadView<TopLevelResource> {
     this.matchSubstring = matchSubstring;
   }
 
+  @Option(
+    name = "--regex",
+    aliases = {"-r"},
+    metaVar = "REGEX",
+    usage = "match group regex"
+  )
+  public void setMatchRegex(String matchRegex) {
+    this.matchRegex = matchRegex;
+  }
+
   @Option(
     name = "--suggest",
     aliases = {"-s"},
@@ -237,6 +249,10 @@ public class ListGroups implements RestReadView<TopLevelResource> {
       return suggestGroups();
     }
 
+    if (!Strings.isNullOrEmpty(matchSubstring) && !Strings.isNullOrEmpty(matchRegex)) {
+      throw new BadRequestException("Specify one of m/r");
+    }
+
     if (owned) {
       return getGroupsOwnedBy(user != null ? userFactory.create(user) : identifiedUser.get());
     }
@@ -328,6 +344,9 @@ public class ListGroups implements RestReadView<TopLevelResource> {
     if (!Strings.isNullOrEmpty(matchSubstring)) {
       return true;
     }
+    if (!Strings.isNullOrEmpty(matchRegex)) {
+      return true;
+    }
     return false;
   }
 
@@ -356,6 +375,7 @@ public class ListGroups implements RestReadView<TopLevelResource> {
 
   private List<AccountGroup> filterGroups(Collection<AccountGroup> groups) {
     List<AccountGroup> filteredGroups = new ArrayList<>(groups.size());
+    Pattern pattern = Strings.isNullOrEmpty(matchRegex) ? null : Pattern.compile(matchRegex);
     for (AccountGroup group : groups) {
       if (!Strings.isNullOrEmpty(matchSubstring)) {
         if (!group
@@ -364,6 +384,10 @@ public class ListGroups implements RestReadView<TopLevelResource> {
             .contains(matchSubstring.toLowerCase(Locale.US))) {
           continue;
         }
+      } else if (pattern != null) {
+        if (!pattern.matcher(group.getName()).matches()) {
+          continue;
+        }
       }
       if (visibleToAll && !group.isVisibleToAll()) {
         continue;