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

/
/

Test String

Code Generator

Language

Generated Code

$re = '/^(?<time>.+?)\s+(?<logname>.+?)\s+(?<log>.+?)$/'; $str = '2023-02-06T08:09:46+00:00 kubernetes.var.log.containers.app-test-app-test-space-fb5ffca1ec-0_cf-workloads_opi-05942675f9f0dd17039304733f228e7abd6ebdfd91609baf1a7afefaeb33ced8.log {"stream":"stdout","log":"Console output from test-node-app","docker":{"container_id":"05942675f9f0dd17039304733f228e7abd6ebdfd91609baf1a7afefaeb33ced8"},"kubernetes":{"container_name":"opi","namespace_name":"cf-workloads","pod_name":"app-test-app-test-space-fb5ffca1ec-0","pod_id":"f4f2592e-ed57-4375-aff7-40c7b214abe0","host":"ap-joy-sidecar-5","labels":{"controller-revision-hash":"app-test-app-test-space-fb5ffca1ec-5bb7dc5769","cloudfoundry_org/app_guid":"8fc07280-506c-49b2-ab00-a97222fcf0a5","cloudfoundry_org/guid":"8fc07280-506c-49b2-ab00-a97222fcf0a5","cloudfoundry_org/org_guid":"fdf0a222-33a4-46fd-a7f9-7955b9ea862c","cloudfoundry_org/org_name":"system","cloudfoundry_org/process_type":"web","cloudfoundry_org/source_type":"APP","cloudfoundry_org/space_guid":"f1b70a4b-7581-4214-b128-2f1597f7789d","cloudfoundry_org/space_name":"app-test-space","cloudfoundry_org/version":"ebfde654-e73c-48da-b55b-42a37a6ba139","security_istio_io/tlsMode":"istio","service_istio_io/canonical-name":"app-test-app-test-space-fb5ffca1ec","service_istio_io/canonical-revision":"latest","statefulset_kubernetes_io/pod-name":"app-test-app-test-space-fb5ffca1ec-0"}},"app_id":"8fc07280-506c-49b2-ab00-a97222fcf0a5","instance_id":"f4f2592e-ed57-4375-aff7-40c7b214abe0","structured_data":"[tags@47450 source_type=\\"APP/PROC/WEB\\"]"} '; preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0); // Print the entire match result var_dump($matches);

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php