fix: preserve commas inside regex grouping when splitting filter patterns (#5588)

AviaterRegexFilter#init splits the configured pattern on every comma to
separate multiple regular expressions. That blindly breaks regex
quantifiers such as \d{1,2} or non-capturing alternations like
(a,b|c) because the comma inside the grouping construct is treated as
a top-level separator.

Replace the StringUtils.split call with a parse-aware splitter that
tracks the depth of {}, [], () and respects backslash escapes, so only
top-level commas separate patterns. Apply the change to both copies of
AviaterRegexFilter (filter module and connector/core module).

Add AviaterFilterTest#test_regex_with_quantifier_comma covering: a
single-pattern \d{1,2} quantifier, a multi-pattern list combined with
\d{1,2}, and an open-ended {n,} quantifier.

Fixes #5442

connector/core/src/main/java/com/alibaba/otter/canal/connector/core/filter/AviaterRegexFilter.java

@@ -1,7 +1,6 @@
 package com.alibaba.otter.canal.connector.core.filter;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
@@ -19,7 +18,6 @@ import com.googlecode.aviator.Expression;
  */
 public class AviaterRegexFilter {
 
-    private static final String             SPLIT             = ",";
     private static final String             PATTERN_SPLIT     = "|";
     private static final String             FILTER_EXPRESSION = "regex(pattern,target)";
     private static final RegexFunction      regexFunction     = new RegexFunction();
@@ -43,8 +41,9 @@ public class AviaterRegexFilter {
         if (StringUtils.isEmpty(pattern)) {
             list = new ArrayList<>();
         } else {
-            String[] ss = StringUtils.split(pattern, SPLIT);
+            // fix issue #5442: only split on commas outside regex grouping constructs,
-            list = Arrays.asList(ss);
+            // so quantifiers like \d{1,2} are kept intact.
+            list = splitPattern(pattern);
         }
 
         // 对pattern按照从长到短的排序
@@ -56,6 +55,60 @@ public class AviaterRegexFilter {
         this.pattern = StringUtils.join(list, PATTERN_SPLIT);
     }
 
+    /**
+     * 按顶层逗号拆分多个正则表达式，跳过位于 {}, [], () 内的逗号，避免破坏类似 \d{1,2} 的量词写法。
+     */
+    private static List<String> splitPattern(String pattern) {
+        List<String> result = new ArrayList<>();
+        int braceDepth = 0;
+        int bracketDepth = 0;
+        int parenDepth = 0;
+        int start = 0;
+        int len = pattern.length();
+        for (int i = 0; i < len; i++) {
+            char c = pattern.charAt(i);
+            // 反斜杠转义：跳过下一个字符，避免把 \{ \[ \( 等误判为分组开始
+            if (c == '\\' && i + 1 < len) {
+                i++;
+                continue;
+            }
+            switch (c) {
+                case '{':
+                    braceDepth++;
+                    break;
+                case '}':
+                    if (braceDepth > 0) braceDepth--;
+                    break;
+                case '[':
+                    bracketDepth++;
+                    break;
+                case ']':
+                    if (bracketDepth > 0) bracketDepth--;
+                    break;
+                case '(':
+                    parenDepth++;
+                    break;
+                case ')':
+                    if (parenDepth > 0) parenDepth--;
+                    break;
+                case ',':
+                    if (braceDepth == 0 && bracketDepth == 0 && parenDepth == 0) {
+                        if (i > start) {
+                            result.add(pattern.substring(start, i));
+                        }
+                        start = i + 1;
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+        if (start < len) {
+            result.add(pattern.substring(start));
+        }
+        return result;
+    }
+
     public boolean filter(String filtered) {
         if (StringUtils.isEmpty(pattern)) {
             return defaultEmptyValue;

filter/src/main/java/com/alibaba/otter/canal/filter/aviater/AviaterRegexFilter.java

@@ -1,7 +1,6 @@
 package com.alibaba.otter.canal.filter.aviater;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
@@ -21,7 +20,6 @@ import com.googlecode.aviator.Expression;
  */
 public class AviaterRegexFilter implements CanalEventFilter<String> {
 
-    private static final String             SPLIT             = ",";
     private static final String             PATTERN_SPLIT     = "|";
     private static final String             FILTER_EXPRESSION = "regex(pattern,target)";
     private static final RegexFunction      regexFunction     = new RegexFunction();
@@ -45,8 +43,9 @@ public class AviaterRegexFilter implements CanalEventFilter<String> {
         if (StringUtils.isEmpty(pattern)) {
             list = new ArrayList<>();
         } else {
-            String[] ss = StringUtils.split(pattern, SPLIT);
+            // fix issue #5442: only split on commas outside regex grouping constructs,
-            list = Arrays.asList(ss);
+            // so quantifiers like \d{1,2} are kept intact.
+            list = splitPattern(pattern);
         }
 
         // 对pattern按照从长到短的排序
@@ -58,6 +57,60 @@ public class AviaterRegexFilter implements CanalEventFilter<String> {
         this.pattern = StringUtils.join(list, PATTERN_SPLIT);
     }
 
+    /**
+     * 按顶层逗号拆分多个正则表达式，跳过位于 {}, [], () 内的逗号，避免破坏类似 \d{1,2} 的量词写法。
+     */
+    private static List<String> splitPattern(String pattern) {
+        List<String> result = new ArrayList<>();
+        int braceDepth = 0;
+        int bracketDepth = 0;
+        int parenDepth = 0;
+        int start = 0;
+        int len = pattern.length();
+        for (int i = 0; i < len; i++) {
+            char c = pattern.charAt(i);
+            // 反斜杠转义：跳过下一个字符，避免把 \{ \[ \( 等误判为分组开始
+            if (c == '\\' && i + 1 < len) {
+                i++;
+                continue;
+            }
+            switch (c) {
+                case '{':
+                    braceDepth++;
+                    break;
+                case '}':
+                    if (braceDepth > 0) braceDepth--;
+                    break;
+                case '[':
+                    bracketDepth++;
+                    break;
+                case ']':
+                    if (bracketDepth > 0) bracketDepth--;
+                    break;
+                case '(':
+                    parenDepth++;
+                    break;
+                case ')':
+                    if (parenDepth > 0) parenDepth--;
+                    break;
+                case ',':
+                    if (braceDepth == 0 && bracketDepth == 0 && parenDepth == 0) {
+                        if (i > start) {
+                            result.add(pattern.substring(start, i));
+                        }
+                        start = i + 1;
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+        if (start < len) {
+            result.add(pattern.substring(start));
+        }
+        return result;
+    }
+
     public boolean filter(String filtered) throws CanalFilterException {
         if (StringUtils.isEmpty(pattern)) {
             return defaultEmptyValue;

filter/src/test/java/com/alibaba/otter/canal/filter/AviaterFilterTest.java

@@ -77,6 +77,28 @@ public class AviaterFilterTest {
         Assert.assertEquals(true, result);
     }
 
+    @Test
+    public void test_regex_with_quantifier_comma() {
+        // fix issue #5442: comma inside {n,m} quantifier should not split the pattern
+        AviaterRegexFilter filter = new AviaterRegexFilter("test\\.order_\\d{1,2}");
+        Assert.assertTrue(filter.filter("test.order_5"));
+        Assert.assertTrue(filter.filter("test.order_42"));
+        Assert.assertFalse(filter.filter("test.order_123"));
+        Assert.assertFalse(filter.filter("test.order_"));
+
+        // multiple patterns combined with quantifier should still split correctly
+        AviaterRegexFilter filter2 = new AviaterRegexFilter("test\\.order_\\d{1,2},test\\.user_\\d+");
+        Assert.assertTrue(filter2.filter("test.order_7"));
+        Assert.assertTrue(filter2.filter("test.user_99"));
+        Assert.assertFalse(filter2.filter("test.order_123"));
+
+        // open-ended quantifier {n,}
+        AviaterRegexFilter filter3 = new AviaterRegexFilter("test\\.t_\\d{2,}");
+        Assert.assertTrue(filter3.filter("test.t_12"));
+        Assert.assertTrue(filter3.filter("test.t_123"));
+        Assert.assertFalse(filter3.filter("test.t_1"));
+    }
+
     @Test
     public void testDisordered() {
         AviaterRegexFilter filter = new AviaterRegexFilter("u\\..*,uvw\\..*,uv\\..*,a\\.x,a\\.xyz,a\\.xy,abc\\.x,abc\\.xyz,abc\\.xy,ab\\.x,ab\\.xyz,ab\\.xy");