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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"([a-z_\s]+):(.*)"; string input = @"audit_schema_version:1 event_time:2020-01-23 02:04:52.8531183 sequence_number:1 action_id:LGIF succeeded:false is_column_permission:false session_id:0 server_principal_id:0 database_principal_id:0 target_server_principal_id:0 target_database_principal_id:0 object_id:0 user_defined_event_id:0 transaction_id:0 class_type:LX duration_milliseconds:0 response_rows:0 affected_rows:0 client_ip:10.122.11.71 permission_bitmask:00000000000000000000000000000000 sequence_group_id:259EA444-6A54-41A4-AB05-543F2CA2759D session_server_principal_name: server_principal_name:iamfake server_principal_sid: database_principal_name: target_server_principal_name: target_server_principal_sid: target_database_principal_name: server_instance_name:2019DB1 database_name: schema_name: object_name: statement:Login failed for user 'iamfake'. Reason: Could not find a login matching the name provided. [CLIENT: 10.1.11.71] additional_information:<action_info xmlns=""http://schemas.microsoft.com/sqlserver/2008/sqlaudit_data""><pooled_connection>0</pooled_connection><error>0x00004818</error><state>5</state><address>10.1.11.71</address></action_info> user_defined_information: application_name:Microsoft® Windows® Operating System ."; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx