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

r"
"
gms

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"(?s)\S+@\S+?((?:says?|:)?\s.*?)(?:\s+Message ID|\* +\* +\*)" test_str = ("Message ID: SM9MatRNTnMAYaylR0QgOH///qUUveBCbw== \n" " 2021-07-10T20:48:23.997Z john s (X Y Bank) -\n" " john.s@xy.com: \n" " [EVENT] 347376954900491 (john.s@xy.com) created room\n" " (roomName='CSTest' roomDescription='CS Test Chat Room' COPY_DISABLED=false\n" " READ_ONLY=false DISCOVERABLE=false MEMBER_ADD_USER_ENABLED=false\n" " roomType=PRIVATE conversationScope=internal owningCompany=X Y\n" " Bank)\n" " \n" " Message ID: nsabNaqeXfuEj9mBEhvS0n///qUUveAhbw== \n" " 2021-07-10T20:48:23.997Z john s (X Y Bank) -\n" " john.s@xy.comsays \n" " [EVENT] 347376954900491 (john.s@xy.com) invited 347376954900486\n" " (kerren.n@xy.com) to room (CSTest|john s|16091907435583)\n" " \n" " Message ID: Nu/EYTkTQ5qdbqzZ0Rig8n///qUUvQ42dA== \n" " 2021-07-10T20:48:23.997Z john s (X Y Bank) -\n" " john.s@xy.comsays \n" " \n" " Catchyou later\n" " \n" " \n" " \n" " Message ID: dy2yaByqhm+n88Gd3VQOhH///qUUrz8odA== \n" " 2021-07-10T20:48:23.997Z kerren n (X Y Bank) -\n" " nancy.n@xy.comsays \n" " \n" " KeywordContent_ Cricket is a bat-and-ball game played between two teams of\n" " eleven players on a field at the centre of which is a 20-metre (22-yard) pitch\n" " with a wicket at each end, each comprising two bails balanced on three stumps.\n" " The batting side scores runs by striking the ball bowled at the wicket with\n" " the bat, while the bowling and fielding side tries to prevent this and dismiss\n" " each player (so they are \"out\").\n" " \n" " \n" " \n" " * * *\n" " \n" " Generated by Content Export Service | Stream Type: SymphonyPost |\n" " Stream ID: ZZo5pRRPFC18uzlonFjya3///qUUveBHdA== | Room Type: Private |\n" " Conversation Scope: internal | Owning Company: X Y Bank | File\n" " Generated Date: 2021-07-10T20:48:23.997Z | Content Start Date:\n" " 2021-07-10T20:48:23.997Z | Content Stop Date: 2021-07-10T20:48:23.997Z \n" " \n" " * * *\n" " \n" " *** (780787) Disclaimer: \n" " (incorporated in paris with Ref. No. ZC18, is authorised by Prudential Regulation\n" " Authority (PRA) and regulated by Financial Conduct Authority and PRA. oyp and\n" " its affiliates (We) monitor this confidential message meant for your\n" " information only. We make no recommendation or offer. You should get\n" " independent advice. We accept no liability for loss caused hereby. See market\n" " commentary disclaimers (\n" " http://wholesalebanking.com/en/utility/Pages/d-mkt.aspx ),\n" " Dodd-Frank and EMIR disclosures (\n" " http://wholesalebanking.com/en/capabilities/financialmarkets/Pages/default.aspx\n" " ) ") matches = re.finditer(regex, test_str, re.MULTILINE | re.DOTALL) 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