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

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r#"(Data\": )\""#).unwrap(); let string = "Event 1 : ========= Input Event : [so much data exists in the same single line ] ,\\\"Comments\\\": \\\"New alert\\\", \"Data\": \"{\\\"etype\\\":\\\"MalwareFamily\\\",\\\"at\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"md\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"Investigations\\\":[{\\\"$id\\\":\\\"1\\\",\\\"Id\\\":\\\"urn:ZappedUrlInvestigation:2cc87ae3\\\",\\\"InvestigationStatus\\\":\\\"Running\\\"}],\\\"InvestigationIds\\\":[\\\"urn:ZappedUrlInvestigation:2cc8782d063\\\"],\\\"Intent\\\":\\\"Probing\\\",\\\"ResourceIdentifiers\\\":[{\\\"$id\\\":\\\"2\\\",\\\"AadTenantId\\\":\\\"2dfb29-729c918\\\",\\\"Type\\\":\\\"AAD\\\"}],\\\"AzureResourceId\\\":null,\\\"WorkspaceId\\\":null,\\\"Metadata\\\":{\\\"CustomApps\\\":null,\\\"GenericInfo\\\":null},\\\"Entities\\\":[{\\\"$id\\\":\\\"3\\\",\\\"MailboxPrimaryAddress\\\":\\\"abc@gmail.com\\\",\\\"Upn\\\":\\\"abc@gmail.com\\\",\\\"AadId\\\":\\\"6eac3b76357\\\",\\\"RiskLevel\\\":\\\"None\\\",\\\"Type\\\":\\\"mailbox\\\",\\\"Urn\\\":\\\"urn:UserEntity:10338af2b6c\\\",\\\"Source\\\":\\\"TP\\\",\\\"FirstSeen\\\":\\\"0001-01-01T00:00:00\\\"}, \\\"StartTimeUtc\\\": \\\"2024-06-21T10:12:37\\\", \\\"Status\\\": \\\"Investigation Started\\\"}\",\"EntityType\": \"MalwareFamily\", [so much data exists in the same single line ] Event 2 : ======= [so much data exists in the same single line ] ,\\\"Comments\\\": \\\"New alert\\\", \"Data\": \"{\\\"etype\\\":\\\"MalwareFamily\\\",\\\"at\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"md\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"Investigations\\\":[{\\\"$id\\\":\\\"1\\\",\\\"Id\\\":\\\"urn:ZappedUrlInvestigation:2cc87ae3\\\",\\\"InvestigationStatus\\\":\\\"Running\\\"}],\\\"InvestigationIds\\\":[\\\"urn:ZappedUrlInvestigation:2cc8782d063\\\"],\\\"Intent\\\":\\\"Probing\\\",\\\"ResourceIdentifiers\\\":[{\\\"$id\\\":\\\"2\\\",\\\"AadTenantId\\\":\\\"2dfb29-729c918\\\",\\\"Type\\\":\\\"AAD\\\"}],\\\"AzureResourceId\\\":null,\\\"WorkspaceId\\\":null,\\\"Metadata\\\":{\\\"CustomApps\\\":null,\\\"GenericInfo\\\":null},\\\"Entities\\\":[{\\\"$id\\\":\\\"3\\\",\\\"MailboxPrimaryAddress\\\":\\\"abc@gmail.com\\\",\\\"Upn\\\":\\\"abc@gmail.com\\\",\\\"AadId\\\":\\\"6eac3b76357\\\",\\\"RiskLevel\\\":\\\"None\\\",\\\"Type\\\":\\\"mailbox\\\",\\\"Urn\\\":\\\"urn:UserEntity:10338af2b6c\\\",\\\"Source\\\":\\\"TP\\\",\\\"FirstSeen\\\":\\\"0001-01-01T00:00:00\\\"}, \\\"StartTimeUtc\\\": \\\"2024-06-21T10:12:37\\\", \\\"Status\\\": \\\"Investigation Started\\\"}\",\"ids\": [9654,\"78b3\"], [so much data exists in the same single line ] Event 3 : ========== [so much data exists in the same single line ] ,\\\"Comments\\\": \\\"New alert\\\", \"Data\": \"{\\\"etype\\\":\\\"MalwareFamily\\\",\\\"at\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"md\\\":\\\"2024-06-21T11:34:07.0000000Z\\\",\\\"Investigations\\\":[{\\\"$id\\\":\\\"1\\\",\\\"Id\\\":\\\"urn:ZappedUrlInvestigation:2cc87ae3\\\",\\\"InvestigationStatus\\\":\\\"Running\\\"}],\\\"InvestigationIds\\\":[\\\"urn:ZappedUrlInvestigation:2cc8782d063\\\"],\\\"Intent\\\":\\\"Probing\\\",\\\"ResourceIdentifiers\\\":[{\\\"$id\\\":\\\"2\\\",\\\"AadTenantId\\\":\\\"2dfb29-729c918\\\",\\\"Type\\\":\\\"AAD\\\"}],\\\"AzureResourceId\\\":null,\\\"WorkspaceId\\\":null,\\\"Metadata\\\":{\\\"CustomApps\\\":null,\\\"GenericInfo\\\":null},\\\"Entities\\\":[{\\\"$id\\\":\\\"3\\\",\\\"MailboxPrimaryAddress\\\":\\\"abc@gmail.com\\\",\\\"Upn\\\":\\\"abc@gmail.com\\\",\\\"AadId\\\":\\\"6eac3b76357\\\",\\\"RiskLevel\\\":\\\"None\\\",\\\"Type\\\":\\\"mailbox\\\",\\\"Urn\\\":\\\"urn:UserEntity:10338af2b6c\\\",\\\"Source\\\":\\\"TP\\\",\\\"FirstSeen\\\":\\\"0001-01-01T00:00:00\\\"}, \\\"StartTimeUtc\\\": \\\"2024-06-21T10:12:37\\\", \\\"Status\\\": \\\"Investigation Started\\\"}\",\"Name\": \"Phishing Categroy\", [so much data exists in the same single line ] ====== "; let substitution = "$1["; // result will be a String with the substituted value let result = regex.replace_all(string, substitution); println!("{}", result); }

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 Rust, please visit: https://docs.rs/regex/latest/regex/