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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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

/
/
g

Test String

Code Generator

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"(?<=\/N )\d+(?=\/)").unwrap(); let string = "%PDF-1.6 %âăĎÓ 1512 0 obj <</Linearized 1/L 5635614/O 1514/E 2245/N 113/T 5605325/H [ 416 1405]>> endobj xref 1512 6 0000000016 00000 n 0000001821 00000 n 0000001931 00000 n 0000002100 00000 n 0000002136 00000 n 0000000416 00000 n trailer <</Size 1518/Prev 5605312/Root 1513 0 R/Info 1511 0 R/ID[<720CBD84AE51B34BB8D0C5AD08A33EB3><25471AC4CA13884CA95F3124D468A67A>]>> startxref 0 %%EOF 1517 0 obj<</Length 1305/C 2107/Filter/FlateDecode/I 2129/O 2091/S 1789>>stream xÚäUűOTGžőÎ ¨ěşwĺµdY@\\@da¬*OVŔ‚ĺˇ@Qpqmyˆş čVĺ)5I±4Á6Ú”´ýÁZW B %jÚĆX¶­şM­IŐj­I{f é?ĐÉ˝ç›ď;çĚś3÷ć^„€Đ,\"Ib˝ ĐśFÎ’Ő =C)W,}:Ë*Ď‚Ůc]ýÚ§KĽţj|ç×úÔ„€3š6“k||Ć!ĎAů ‰$i“ »Őr‹şÍßËeĎń€E ő]Ĺ!Dţ‘_±%ţáőÁŃÜČĂu]ů ťÍőq–¤“n—ŻÖâˆç5‡>·\\ň{HRÂjE»\"ňéíń5”_~'Ř §ć$n2ř„f/ÉřľKuzČe FVŞtë\\™•¨ÎĽp}ŐűZęŚs;d_üÜş«BrŠ¨}e+˙Quľ}‹¤f Âľ4 ĺÁ§ó.ľ—çí±:«đbnǘυ5·L±¶‡eLňíľĺŐ%żůĆ^~l«jűs8äŃĐ/çššú¶áŘHuÁF´·?íY{Ž>Pâ<ż»ůîžŕ𸞿ސŠĎUzÇ˝{ńó´Đß×íîsYQ˙÷®ä“®ÝWY»ŻśWŢ}Ô×ôÍĐÝŁYâlę±ëÇLŢö0Ăú›&ďűÚ~˜iR<íÚѢ®aÍMĚ®uú9iSM=W5Ł&×30¬˝¶ˇçžFVÔuO'`J° 7ˇÎłťć`çŮ„şĚĺ •(ź'*°|ˇ®óąąss'ÔĂÓŤPě®| D/o˝Ľ ő˛ŔČ_BU~ŔÔţŔÔţ„r´¶ZHč\" Ź`!ŕ ] ˇˇ‹a# aK€„-¸p`Ú`ÚB—G_|Y eV šNšNʼn‰qL¬cž˜´üő«VŻYźś’šŇÚuKčútŻOç•2pĺÖĂ<śa ”lŔ™g„!ˇYŮ\"Îʆ>7Ů´ZŮ´™P -9°â–ÇŽ[sEĽ5s9x€´-OÄŰňx&nřŮĺľ©ů„ÎgŤ‰¸°Č±ÎöŕŮľcâ(‹KD\\\\Bhd0nv–•ľ ®ňŠÝĆ]¸Ľ‚š*÷˛÷­·+(.'UŐL\"5ŚĐZĽŹěŁ¸–=çşýPyÝ~Řń °ƒfŘĺ ™ĐpneÜ‚^ß z}+…Ůh)%·CčˇFˆ9ÔČ+dŔ[h:,*šŔ}˜Ó‹ˆŹX-{(›°=ŹƒĽŁÇŘŮ1 -1˜b=Ţ Eo&Ôχ´`ÚÚ j Á-Ě×Öémí¬dfˇ4!܁0€¨Ž˘IŘ'ČɈPŐ N°iú¬ éa˙2-Š_/Ç«ąlˆđŃR‡O]mZşƒż+ńx5ŕĺ˛^>äH˘P!QD˘‰*‰ë´f×+űˇIĺE[|5¸Ô3U>Ů‘Q\"\"‰¸4cĆţŞţçźdř÷5˘ôÇě°á'ˆ:ůˇ Ů,xŠ¸hń®äş9‹n ęšÎÚGrĆę¬Ńč‡^ż˛ˇsö!_ú×÷Ďzµ;QďUIÍŃ2 ¦…K­QîźôúíÔ?t#÷AÂ`Ą}”çMˆ(Yä2 ˇh`Š8 •eÖ(tŇ9ĄŤ•SB¤fťýzÎŤáŇ f©U†tČ&˜§‚ Vą#´ě° FŮXyZjՁĎě136ÓŔn(Ëw&™)×/EYúxŻ‹$ěŇd±Łěúíěu‡{ü_ bĄö endstream endobj 1513 0 obj<</Outlines 1045 0 R/Metadata 1510 0 R/Pages 1483 0 R/StructTreeRoot 1128 0 R/Type/Catalog>> endobj 1514 0 obj<</CropBox[0.0 0.0 612.0 792.0]/Parent 1485 0 R/StructParents 0/Contents 1516 0 R/Rotate 0/MediaBox[0.0 0.0 612.0 792.0]/Resources 1515 0 R/Type/Page>> endobj 1515 0 obj<</ProcSet[/PDF]>> endobj 1516 0 obj<</Length 39/Filter/FlateDecode>>stream H‰ŇH,*Q°±Ń÷uötQ0P°łsrqćĺâĺrőR  t z endstream endobj 1 0 obj<</CropBox[0.0 0.0 612.0 792.0]/Parent 1485 0 R/StructParents 1/Contents 3 0 R/Rotate 0/MediaBox[0.0 0.0 612.0 792.0]/Resources 2 0 R/Type/Page>> endobj 2 0 obj<</XObject<</Im1 4 0 R/Im2 5 0 R/Im3 6 0 R/Im4 7 0 R/Im5 8 0 R>>/Font<</F4 900 0 R>>/ProcSet[/PDF/Text/ImageC]/ExtGState<</GS1 902 0 R/GS2 903 0 R>>>> endobj 3 0 obj<</Length 468/Filter/FlateDecode>>stream H‰tSÁnÓ@˝WÚ˜crčxgwíµEU)i*Zč*U=¸‰iM;Ř[\"řzĆö&D/¶4~ďÍ{3ăč:o<śťE‹‹ËH8?źÎ.ÄÉÔ‰č­÷Uâş~©Ta‰&LRp!‡đ,¦·˝»QđŘÂü–ën)N%J©ŔíÄčîĆÍÔýŘ}sĐĐßE¦PZ–ěŐlŠ¤3 Ú*T1˜Xa–H ËŤˆ.7łZ|ěďh+‰QĄ µAc:[› ÝőkÍI2ťˇ{Ś:I¤uĚâUSš«ˇyÇŃH2ĄŔ±¨¤Ň Ř.Q†6ł60ô‘Ł%“2Ć*ćŚl=aNŠĆš}Dsˆ¨LçWlŔ2*L˝›éäăd1ů>]ą. 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ŤŹ\\ź[ţVy Ć›úBAÖ[ůeąbhH™Ůkň-463#Ľ×ăäĚGQ=ĚÄîřůĽń|÷çČ3ßHv'ŚÚZJ‡ţĺÓ†ú/ćć¦Ă«XĹ©˘źŽm4˜.Vź˝°»<˙ ŕ_čÉtż•ŢC’Ą4h퉭¬’ŰÓŻÄƒ—ż\\‰ůƒň–í!i´[żŇ±ÇşéÚ—\\-7úµúqtoĺç_ő†\"zil`qů‚OăäĽ:ˆî&'äE~>oFĐ<ÉŁůšĐÝé`ŤÂxXšţI˘z27Ěa®y–;­CFľ7ž˝Ĺ•í‹¤˝‘ w¶‡öcÔ\"űíO·Óőçtňo›Łó=¤‘\\˘ÚëD&ˇf¦ŁqđĎ-ĚRuSôu^\\& x˘yĚY„ý$pČs ź+/+)mo+/+˙"; // 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/