Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

`
`
gm

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(DELIMITER ;;[\\S\\s]*?DELIMITER ;)"; final String string = "--\n" + "-- Dumping data for table `SOME_TABLE`\n" + "--\n\n" + "LOCK TABLES `SOME_TABLE` WRITE;\n" + "/*!40000 ALTER TABLE `SOME_TABLE` DISABLE KEYS */;\n" + "/*!40000 ALTER TABLE `SOME_TABLE` ENABLE KEYS */;\n" + "UNLOCK TABLES;\n" + "/*!50003 SET @saved_cs_client = @@character_set_client */ ;\n" + "/*!50003 SET @saved_cs_results = @@character_set_results */ ;\n" + "/*!50003 SET @saved_col_connection = @@collation_connection */ ;\n" + "/*!50003 SET character_set_client = utf8 */ ;\n" + "/*!50003 SET character_set_results = utf8 */ ;\n" + "/*!50003 SET collation_connection = utf8_general_ci */ ;\n" + "/*!50003 SET @saved_sql_mode = @@sql_mode */ ;\n" + "/*!50003 SET sql_mode = 'ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' */ ;\n" + "DELIMITER ;;\n" + "/*!50003 CREATE*/ /*!50017 */ /*!50003 TRIGGER SOME_TABLE_BU BEFORE UPDATE ON SOME_TABLE \n" + "FOR EACH ROW\n\n" + "BEGIN \n" + " \n" + " IF (OLD.DUE_DATE<>NEW.DUE_DATE) THEN\n" + " SET NEW.COUNT=0;\n" + " INSERT INTO SOME_TABLE_RESET_COUNT(SOME_TABLE_ID,CAL_DUE_DATE,COUNT,USER_ID) VALUES(OLD.ID,OLD.DUE_DATE,OLD.CYCLE_COUNT,NEW.CAL_BY);\n" + " END IF;\n" + "END */;;\n" + "DELIMITER ;\n" + "/*!50003 SET sql_mode = @saved_sql_mode */ ;\n" + "/*!50003 SET character_set_client = @saved_cs_client */ ;\n" + "/*!50003 SET character_set_results = @saved_cs_results */ ;\n" + "/*!50003 SET collation_connection = @saved_col_connection */ ;\n" + "/*!50003 SET @saved_cs_client = @@character_set_client */ ;\n" + "/*!50003 SET @saved_cs_results = @@character_set_results */ ;\n" + "/*!50003 SET @saved_col_connection = @@collation_connection */ ;\n" + "/*!50003 SET character_set_client = utf8 */ ;\n" + "/*!50003 SET character_set_results = utf8 */ ;\n" + "/*!50003 SET collation_connection = utf8_general_ci */ ;\n" + "/*!50003 SET @saved_sql_mode = @@sql_mode */ ;\n" + "/*!50003 SET sql_mode = 'NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' */ ;\n" + "DELIMITER ;;\n" + "/*!50003 CREATE*/ /*!50017 */ /*!50003 TRIGGER SOME_TABLE_AU\n" + "AFTER UPDATE ON SOME_TABLE \n" + "FOR EACH ROW\n\n" + "BEGIN \n" + " IF IFNULL(OLD.RESET_REASON,'') <> IFNULL(NEW.RESET_REASON,'') THEN\n" + " INSERT INTO SOME_TABLE_RESET_NEXT_DUE(REASON,SOME_TABLE_ID,NEW_CAL_DATE,OLD_CAL_DATE)\n" + " VALUES(NEW.RESET_REASON,NEW.ID,NEW.DUE_DATE,OLD.DUE_DATE);\n" + " END IF;\n" + "END */;;\n" + "DELIMITER ;\n" + "/*!50003 SET sql_mode = @saved_sql_mode */ ;\n" + "/*!50003 SET character_set_client = @saved_cs_client */ ;\n" + "/*!50003 SET character_set_results = @saved_cs_results */ ;\n" + "/*!50003 SET collation_connection = @saved_col_connection */ ;"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html