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

/
/
gmi

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"^.*(?:EVENTS:OB:\s(?:RECORDS\snot|RECORDS\sthat|Unprocessed))(?!.*0\.0$).*$" test_str = ("EVENTS:OB: Records not updated to status\n" "EVENTS:OB: Records that were pending OR to be processed for yester day. \n" "EVENTS:OB: Unprocessed records older than hour. \n" "RENAS:OB:BOX: Unprocessed records older than hour. \n" "RENAS:MOSS Pending \n" "RENAS:TIGNET Pending \n" "RENAS:OB:SI: Unprocessed records older than hour. \n" "RENAS:OB:GC: Unprocessed records older than hour. \n" "RENAS:RENAS:Count of pending message to process. \n" "RENAS:OB:10+2_Status: Unprocessed records older than hour.\n" "RENAS:RENAS_10+2:Unprocessed records in RENAS 10+2\n" "RENAS:RENAS ACH:Count of pending message to process to FV.\n" "RENAS:CheckNow:Count of pending message to process to FV\n" "RENAS:OB:GB: Unprocessed records older than hour.\n" "RENAS:RENAS: UN Processed records by MIXX for RENAS INSTRUCTONS \n" "RENAS:RENAS: UN Processed records by MIXX for RENAS Break Bulk \n" "RENAS:RENAS: UN Processed records by MIXX for RENAS \n" "RENAS:OB:DOM:Unprocessed count of records older than hour.\n" "RENAS:OB:DOM:Failed records in the database for previous date.\n" "RENAS:OB:SI:Records that were pending to be processed for the previous day.") matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE) 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