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

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r",User:\s+\"*(?<user>.+)\"*,Source computer" test_str = ("2017-02-12 14:02:05,Virus found,Source: Scheduled Scan,Risk name: OSX.Trojan.Gen,Occurrences: 1,/Users/71071190/Downloads/archive_manager.dmg,'',Actual action: Deleted,Requested action: Deleted,Secondary action: Deleted,Event time: 2017-02-08 22:38:17,Inserted: 2017-02-12 20:02:05,End: 2017-02-08 22:38:17,Last update time: 2017-02-12 20:02:05,Domain: North America,Group: My Company\\North America\\Workstations\\Macs,User: \"ABCD, XYZ {FGH}\",Source computer: ,Source IP: ,Disposition: Good,Download site: null,Web domain: null,Downloaded by: null,Prevalence: Reputation was not used in this detection.,Confidence: Reputation was not used in this detection.,URL Tracking Status: Off,,First Seen: Reputation was not used in this detection.,Sensitivity: Low,MDS,Application hash: ,Hash type: SHA1,Company name: ,Application name: ,Application version: ,Application type: -1,File size (bytes): 0,Category set: Security risk,Category type: UNKNOWN\n" "2017-02-12 14:02:05,Virus found,Source: Scheduled Scan,Risk name: OSX.Trojan.Gen,Occurrences: 1,/Users/71071190/Downloads/archive_manager.dmg,'',Actual action: Deleted,Requested action: Deleted,Secondary action: Deleted,Event time: 2017-02-08 22:38:17,Inserted: 2017-02-12 20:02:05,End: 2017-02-08 22:38:17,Last update time: 2017-02-12 20:02:05,Domain: North America,Group: My Company\\North America\\Workstations\\Macs,User: 12345678,Source computer: ,Source IP: ,Disposition: Good,Download site: null,Web domain: null,Downloaded by: null,Prevalence: Reputation was not used in this detection.,Confidence: Reputation was not used in this detection.,URL Tracking Status: Off,,First Seen: Reputation was not used in this detection.,Sensitivity: Low,MDS,Application hash: ,Hash type: SHA1,Company name: ,Application name: ,Application version: ,Application type: -1,File size (bytes): 0,Category set: Security risk,Category type: UNKNOWN") matches = re.finditer(regex, test_str) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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