Examples of RegexStringComparator

org.apache.hadoop.hbase.filter.RegexStringComparator
P address "(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3,3}" + "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\/[0-9]+)?" + "|" + // v6 IP address "((([\\dA-Fa-f]{1,4}:){7}[\\dA-Fa-f]{1,4})(:([\\d]{1,3}.)" + "{3}[\\d]{1,3})?)(\\/[0-9]+)?"));
org.hbase.async.RegexStringComparator
.com/~rsc/regexp/regexp1.html">Regular Expression Matching Can Be Simple And Fast for more details on regular expression performance (or lack thereof) and what "backtracking" means.
This means you need to be careful about using regular expressions supplied by users as that would allow them to easily DDoS HBase by sending prohibitively expensive regexps that would consume all CPU cycles and cause the entire HBase node to time out.
Only EQUAL and NOT_EQUAL comparisons are valid with this comparator. @since 1.6

Examples of org.apache.hadoop.hbase.filter.RegexStringComparator


      Scan scan = new Scan();
      scan.addFamily(ACL_LIST_FAMILY);


      String columnName = Bytes.toString(column);
      scan.setFilter(new QualifierFilter(CompareOp.EQUAL, new RegexStringComparator(
                     String.format("(%s%s%s)|(%s%s)$",
                     ACL_KEY_DELIMITER, columnName, ACL_KEY_DELIMITER,
                     ACL_KEY_DELIMITER, columnName))));


      Set<byte[]> qualifierSet = new TreeSet<byte[]>(Bytes.BYTES_COMPARATOR);

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Examples of org.hbase.async.RegexStringComparator


    final Scanner regex_scanner = client.newScanner(table);
    regex_scanner.setStartKey("fc1");
    regex_scanner.setStopKey("fc4");
    regex_scanner.setFilter(
        new RowFilter(CompareOp.EQUAL, new RegexStringComparator("fc2")));
    final ArrayList<ArrayList<KeyValue>> regex_rows =
        regex_scanner.nextRows().join();
    assertSizeIs(1, regex_rows);
    assertSizeIs(1, regex_rows.get(0));
    assertEq("v2", regex_rows.get(0).get(0).value());

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