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"
"
gmi

Test String

Substitution

Processing...

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"(\w+\s+)(\w+\?*\s+)(\w+)\s+(\{.+\})" test_str = ("public Guid DellUploadItemID { get; set; }\n" "public Guid UploadID { get; set; }\n" "public string DellPurchaseID { get; set; }\n" "public string PoNum { get; set; }\n" "public string OrderNum { get; set; }\n" "public string OrderType { get; set; }\n" "public string InvoiceNum { get; set; }\n" "public string PaymentDescription { get; set; }\n" "public DateTime? OrderDate { get; set; }\n" "public DateTime? ShippedDate { get; set; }\n" "public DateTime? InvoiceDate { get; set; }\n" "public decimal ReportLineTotal { get; set; }\n" "public string ServiceTag { get; set; }\n" "public string Category { get; set; }\n" "public string SubCategory { get; set; }\n" "public string Item { get; set; }\n" "public string ItemLongName { get; set; }\n" "public DateTime? WarrantyEndDate { get; set; }\n" "public string ShipFirstName { get; set; }\n" "public string ShipLastName { get; set; }\n" "public string ShipToCompany { get; set; }\n" "public string ShipAddress1 { get; set; }\n" "public string ShipAddress2 { get; set; }\n" "public string ShipCity { get; set; }\n" "public string ShipState { get; set; }\n" "public string ShipZip { get; set; }\n" "public string ShipMethod { get; set; }\n" "public string CarrierName { get; set; }\n" "public string WaybillNumber { get; set; }\n" "public string ExpressServiceCode { get; set; }\n" "public string MACAddress { get; set; }\n" "public string MACAddress2 { get; set; }") subst = "\\3 = d.\\3," # You can manually specify the number of replacements by changing the 4th argument result = re.sub(regex, subst, test_str, 0, re.MULTILINE | re.IGNORECASE) if result: print (result) # 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