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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"errorDescription\"\:\"(?<errorDescription>[^\"]+).+errorCode\"\:\"(?<errorCode>[^\"]+)") test_str = ("2016-10-25 12:33:31,926 [http-00000:13111-2] INFO [org.apache.cxf.interceptor.LoggingInInterceptor ?] Inbound Message ---------------------------- \n" " ID: 18 Response-Code: 200\n" " Encoding: UTF-8 \n" " Content-Type: application/json;charset=UTF-8\n" " Headers: {content-type=[application/json;charset=UTF-8], Date=[Tue, 25 Oct 2016 17:33:30 GMT], Expires=[Thu, 01 Jan 1970 00:00:00 GMT], Set-Cookie=[BrowserId=L8p9Eij0T4Sfp-INSP9zDw;Path=/;Domain=.salesforce;Expires=Sat, 24-Dec-2016 17:33:30 GMT], transfer-encoding=[chunked]} \n" " \n" " Payload: {\"responseCode\":\"201\",\"messageId\":\"704c8163-13d4-42b8-a684-94b9d23e849e\",\n" " \"lead\":[{\"responseCode\":\"201\",\"leadID\":null,\"errors\":[{\"errorField\":\"head\",\"errorDescription\":\"The value of email is invalid.\",\"errorCode\":\"Value_Invalid_E400\"},{\"errorField\":\"bestTimeToContact\",\"errorDescription\":\"The value of bestTimeToContact is invalid.\",\"errorCode\":\"Value_Invalid_E400\"}]}]} \n" " ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------\n" " 2016-10-25 12:33:31,986 [http-000000:13111-2] INFO [org.apache.cxf.interceptor.LoggingOutInterceptor ?] Outbound Message --------------------------- \n" " ID: 17 \n" " Response-Code: 200 \n" " Content-Type: application/json\n" " Headers: {Content-Type=[application/json], Date=[Tue, 25 Oct 2016 17:33:31 GMT]}\n" " Payload: {\"errors\":[{\"errorCode\":\"Value_Invalid_E400\",\"errorDescription\":\"The value of email is invalid.\",\"errorField\":\"head\"},{\"errorCode\":\"Value_Invalid_E400\",\"errorDescription\":\"The value of bestTimeToContact is invalid.\",\"errorField\":\"bestTimeToContact\"}]} --------------------------------------") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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 Python, please visit: https://docs.python.org/3/library/re.html