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

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"(?m)\{\{*CreateDate*\}\}").unwrap(); let string = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?> <w:document xmlns:wpc=\"http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas\" xmlns:cx=\"http://schemas.microsoft.com/office/drawing/2014/chartex\" xmlns:cx1=\"http://schemas.microsoft.com/office/drawing/2015/9/8/chartex\" xmlns:cx2=\"http://schemas.microsoft.com/office/drawing/2015/10/21/chartex\" xmlns:cx3=\"http://schemas.microsoft.com/office/drawing/2016/5/9/chartex\" xmlns:cx4=\"http://schemas.microsoft.com/office/drawing/2016/5/10/chartex\" xmlns:cx5=\"http://schemas.microsoft.com/office/drawing/2016/5/11/chartex\" xmlns:cx6=\"http://schemas.microsoft.com/office/drawing/2016/5/12/chartex\" xmlns:cx7=\"http://schemas.microsoft.com/office/drawing/2016/5/13/chartex\" xmlns:cx8=\"http://schemas.microsoft.com/office/drawing/2016/5/14/chartex\" xmlns:mc=\"http://schemas.openxmlformats.org/markup-compatibility/2006\" xmlns:aink=\"http://schemas.microsoft.com/office/drawing/2016/ink\" xmlns:am3d=\"http://schemas.microsoft.com/office/drawing/2017/model3d\" xmlns:o=\"urn:schemas-microsoft-com:office:office\" xmlns:oel=\"http://schemas.microsoft.com/office/2019/extlst\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" xmlns:m=\"http://schemas.openxmlformats.org/officeDocument/2006/math\" xmlns:v=\"urn:schemas-microsoft-com:vml\" xmlns:wp14=\"http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing\" xmlns:wp=\"http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing\" xmlns:w10=\"urn:schemas-microsoft-com:office:word\" xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\" xmlns:w14=\"http://schemas.microsoft.com/office/word/2010/wordml\" xmlns:w15=\"http://schemas.microsoft.com/office/word/2012/wordml\" xmlns:w16cex=\"http://schemas.microsoft.com/office/word/2018/wordml/cex\" xmlns:w16cid=\"http://schemas.microsoft.com/office/word/2016/wordml/cid\" xmlns:w16=\"http://schemas.microsoft.com/office/word/2018/wordml\" xmlns:w16sdtdh=\"http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash\" xmlns:w16se=\"http://schemas.microsoft.com/office/word/2015/wordml/symex\" xmlns:wpg=\"http://schemas.microsoft.com/office/word/2010/wordprocessingGroup\" xmlns:wpi=\"http://schemas.microsoft.com/office/word/2010/wordprocessingInk\" xmlns:wne=\"http://schemas.microsoft.com/office/word/2006/wordml\" xmlns:wps=\"http://schemas.microsoft.com/office/word/2010/wordprocessingShape\" mc:Ignorable=\"w14 w15 w16se w16cid w16 w16cex w16sdtdh wp14\"> <w:body> <w:p w14:paraId=\"1599AF6E\" w14:textId=\"34AAE6AB\" w:rsidR=\"00F64201\" w:rsidRDefault=\"00B721B4\" w:rsidP=\"00B721B4\"> <w:pPr> <w:pStyle w:val=\"Heading1\"/> </w:pPr> <w:r> <w:t>{{</w:t> </w:r> <w:proofErr w:type=\"spellStart\"/> <w:r> <w:t>Company_Name</w:t> </w:r> <w:proofErr w:type=\"spellEnd\"/> <w:r> <w:t>}} {{APP}} Account Data</w:t> </w:r> </w:p> <w:p w14:paraId=\"278C6776\" w14:textId=\"1B6000C5\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"/> <w:tbl> <w:tblPr> <w:tblStyle w:val=\"TableGrid\"/> <w:tblW w:w=\"0\" w:type=\"auto\"/> <w:tblLook w:val=\"04A0\" w:firstRow=\"1\" w:lastRow=\"0\" w:firstColumn=\"1\" w:lastColumn=\"0\" w:noHBand=\"0\" w:noVBand=\"1\"/> </w:tblPr> <w:tblGrid> <w:gridCol w:w=\"1870\"/> <w:gridCol w:w=\"1870\"/> <w:gridCol w:w=\"1870\"/> <w:gridCol w:w=\"1870\"/> <w:gridCol w:w=\"1870\"/> </w:tblGrid> <w:tr w:rsidR=\"00B721B4\" w14:paraId=\"100413BB\" w14:textId=\"77777777\" w:rsidTr=\"00B721B4\"> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"5FD7C610\" w14:textId=\"015F6641\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>Name</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"73D639A3\" w14:textId=\"0258323E\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:proofErr w:type=\"spellStart\"/> <w:r> <w:t>CreateDate</w:t> </w:r> <w:proofErr w:type=\"spellEnd\"/> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"7C6E1CA5\" w14:textId=\"4B5E3085\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>VIP</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"274DDEA7\" w14:textId=\"516124C5\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>Points</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"7163781E\" w14:textId=\"460DA08B\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>Remark</w:t> </w:r> </w:p> </w:tc> </w:tr> <w:tr w:rsidR=\"00B721B4\" w14:paraId=\"35A728A6\" w14:textId=\"77777777\" w:rsidTr=\"00B721B4\"> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"0775B817\" w14:textId=\"17DA096B\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>{{Name}}</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"4A2404F3\" w14:textId=\"6CC57F74\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>Hello World Company</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"62DEB9C3\" w14:textId=\"618125BB\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>{{VIP}}</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"158965BA\" w14:textId=\"1EA5CD08\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t>{{Points}}</w:t> </w:r> </w:p> </w:tc> <w:tc> <w:tcPr> <w:tcW w:w=\"1870\" w:type=\"dxa\"/> </w:tcPr> <w:p w14:paraId=\"53105C06\" w14:textId=\"07109D26\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"> <w:r> <w:t xml:space=\"preserve\">{{Name}} has </w:t> </w:r> <w:r w:rsidRPr=\"005F3C0A\"> <w:rPr> <w:color w:val=\"FF0000\"/> </w:rPr> <w:t xml:space=\"preserve\">{{Points}} </w:t> </w:r> <w:r> <w:t>points</w:t> </w:r> </w:p> </w:tc> </w:tr> </w:tbl> <w:p w14:paraId=\"671D355C\" w14:textId=\"77777777\" w:rsidR=\"00B721B4\" w:rsidRDefault=\"00B721B4\"/> <w:sectPr w:rsidR=\"00B721B4\"> <w:pgSz w:w=\"12240\" w:h=\"15840\"/> <w:pgMar w:top=\"1440\" w:right=\"1440\" w:bottom=\"1440\" w:left=\"1440\" w:header=\"720\" w:footer=\"720\" w:gutter=\"0\"/> <w:cols w:space=\"720\"/> <w:docGrid w:linePitch=\"360\"/> </w:sectPr> </w:body> </w:document>"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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 Rust, please visit: https://docs.rs/regex/latest/regex/