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

// 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"(?m)MaximumBatchQuantity[^:]+:(?<MaximumBatchQuantity>[^,]+)").unwrap(); let string = "{\"bdy\":{\"msg\":\"HttpRequest\",\"addInfo\":[{\"key\":\"Url\",\"value\":\"https://isp0064x.st.ad.XXXXX.com/XXXXXOmniFulfillmentServerApp/api/Assignment/Auto/\"},{\"key\":\"Content\",\"value\":\"{\\\"Filters\\\":[],\\\"MaximumBatchQuantity\\\":20,\\\"AllowedSLAMilliSeconds\\\":4500,\\\"AssociateFirstName\\\":\\\"Aliona\\\",\\\"AssociateId\\\":\\\"2795969\\\",\\\"AssociateLastName\\\":\\\"Cieniawa\\\",\\\"Header\\\":{\\\"ApiVersion\\\":null,\\\"AppVersion\\\":\\\"18.3.0.15617\\\",\\\"JsonWebToken\\\":null,\\\"MessageId\\\":\\\"de959d4f-6a7d-4c0c-98d3-1143064b4300\\\"},\\\"IsOffline\\\":false,\\\"SLARequestKey\\\":\\\"AutoBatch\\\",\\\"StoreNumber\\\":\\\"0064\\\"}\"},{\"key\":\"CorrelationId\",\"value\":\"\"},{\"key\":\"MessageId\",\"value\":\"3a04038d-64e2-493c-b489-90a922de1980\"}]},\"hdr\":{\"level\":\"Verbose\",\"timestamp\":\"2018-06-04T21:03:19.6347626Z\",\"fxsrc\":\"LogRequestInfo\",\"lineNum\":710,\"userId\":\"2795969\",\"loc\":\"Store\",\"locId\":\"0064\",\"ip\":\"10.224.255.15\",\"hostName\":\"K-W10ME-7463352\",\"macaddress\":\"00-16-XX-16-A6-FA\",\"eventid\":0,\"appVersion\":\"18.3.0.15617\",\"appName\":\"OmniFulfillment\",\"deviceModel\":\"XX500\",\"osVersion\":\"10.0.14393.2007\",\"firmwareVersion\":\"1049.7.18039.0\",\"networkSignalStrength\":\"4\",\"isConnected\":\"True\"},\"ver\":\"0.1\"}"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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/