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

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"(?<=KilometreSI I\\r\\n\*).[0-9\s]+" test_str = "El\\r\\n_I ERNST&YOUNC Expense Report\\r\\nI Date Prepared: 01-08-2019 I Managing Country: XE I\\r\\nI Submitted: 01-08-2019 (In Audit) | Business Unit: XE045 I\\r\\n| GPN - Name: XE021000618 — Paul Prashanth | Management Unit: 00801 Sub Management Unit: 0907302 |\\r\\nI Signature: I Approved By: Rank: I\\r\\nI Rank: Administrative Contractor I Approval Signature: I\\r\\nI Expense Details (Attach supporting receipts) I Total Net IC = Chargeable P = Authorized I\\r\\nI Loc I Expense Type I Date I Description I Expense Expense I Type I Engagement I Activity I\\r\\nOTHER International Travel-Non-Billable - Ground 01-08-2019 Need clarification for claiming the taxi expenses P 33800872 0000\\r\\nTransportation - Mass/Public Transportation from same vendor for INR 2400 & No receipts fo\\r\\nTelephone for GBP l (INR 97.89) & Taxi for GB\\r\\n25 (INR 2470.75) Barcode : 2170270878\\r\\nI IIIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIII IIII Tom’s I 0.00 I 0.00 I Tom] KilometreSI I\\r\\n* 2 1 7 1 9 5 9 5 2 8 it Report Date Format: dd-mm-yyyy\\r\\nPage 1 of 1 10-06-2020" matches = re.finditer(regex, test_str, re.MULTILINE) 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