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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
Processing...

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 = "^(?P<bucket>[^\\/]+)\\/(?:(?P<prefix>.+)\\/)?AWSLogs\\/(?P<aws_account_id>[\\d]{12})\\/elasticloadbalancing\\/(?P<region>[\\w\\d\\-]+)\\/(?P<year>\\d{4})\\/(?P<month>\\d{2})\\/(?P<day>\\d{2})\\/(?P=aws_account_id)_elasticloadbalancing_(?P=region)_(?P<load_balancer_id>[\\w\\.\\-\\d]+)_(?P<end_time>\\d{8}T\\d{4}Z)_(?P<ip_address>(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))_(?P<random_string>.+)\\.log\\.gz$"; final String string = "log-bucket/AWSLogs/113901497002/elasticloadbalancing/us-east-1/2020/04/26/113901497002_elasticloadbalancing_us-east-1_app.us-east-lt-alb.5ac1c221b7cf2245_20200426T0225Z_34.233.232.149_nhinzchd.log.gz\n" + "log-bucket/web-lt/AWSLogs/113901497002/elasticloadbalancing/us-east-1/2020/04/26/113901497002_elasticloadbalancing_us-east-1_app.us-east-lt-alb.5ac1c221b7cf2245_20200426T0225Z_34.233.232.149_nhinzchd.log.gz\n"; 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