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

$re = '/^(?P<nlb_type>tls)\s*(?P<nlb_version>1\.0)\s*(?P<nlb_timestamp>[^\s]+)\s*(?P<nlb_elb>[^\s]+)\s*(?P<nlb_listener>[^\s]+)\s*(?P<nlb_client_addr>[^:]+):\s*(?P<nlb_client_port>[^\s]+)\s*(?P<nlb_target_addr>[^:]+):\s*(?P<nlb_target_port>[^\s]+)\s*(?P<nlb_connection_time>[^\s]+)\s*(?P<nlb_tls_handshake_time>[^\s]+)\s*(?P<nlb_received_bytes>[^\s]+)\s*(?P<nlb_sent_bytes>[^\s]+)\s*(?P<nlb_Incoming_tls_alert>[^\s]+)\s*(?P<nlb_chosen_cert_arn>[^\s]+)\s*(?P<nlb_chosen_cert_serial>[^\s]+)\s*(?P<nlb_tls_cipher>[^\s]+)\s*(?P<nlb_tls_protocol_version>[^\s]+)\s*(?P<nlb_tls_named_group>[^\s]+)\s*(?P<nlb_domain_name>[^\s]+)/m'; $str = 'tls 1.0 2018-12-20T02:59:40 net/my-network-loadbalancer/c6e77e28c25b2234 g3d4b5e8bb8464cd 72.21.218.154:51341 172.100.100.185:443 5 2 98 246 - arn:aws:acm:us-east-2:671290407336:certificate/2a108f19-aded-46b0-8493-c63eb1ef4a99 - ECDHE-RSA-AES128-SHA tlsv12 - my-network-loadbalancer-c6e77e28c25b2234.elb.us-east-2.amazonaws.com'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($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