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
No Match

/
/
g

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"(?<=\/N )\d+(?=\/)" test_str = ("%PDF-1.6\n" "%âăĎÓ\n" "1512 0 obj <</Linearized 1/L 5635614/O 1514/E 2245/N 113/T 5605325/H [ 416 1405]>>\n" "endobj\n" " \n" "xref\n" "1512 6\n" "0000000016 00000 n\n" "0000001821 00000 n\n" "0000001931 00000 n\n" "0000002100 00000 n\n" "0000002136 00000 n\n" "0000000416 00000 n\n" "trailer\n" "<</Size 1518/Prev 5605312/Root 1513 0 R/Info 1511 0 R/ID[<720CBD84AE51B34BB8D0C5AD08A33EB3><25471AC4CA13884CA95F3124D468A67A>]>>\n" "startxref\n" "0\n" "%%EOF\n" " \n" "1517 0 obj<</Length 1305/C 2107/Filter/FlateDecode/I 2129/O 2091/S 1789>>stream\n" "xÚäUűOTGžőÎ ¨ěşwĺµdY@\\@da¬*OVŔ‚ĺˇ@Qpqmyˆş čVĺ)5I±4Á6Ú”´ýÁZW B %jÚĆX¶­şM­IŐj­I{f é?ĐÉ˝ç›ď;çĚś3÷ć^„€Đ,\"Ib˝\n" "ĐśFÎ’Ő =C)W,}:Ë*Ď‚Ůc]ýÚ§KĽţj|ç×úÔ„€3š6“k||Ć!ĎAů ‰$i“ »Őr‹şÍßËeĎń€E ő]Ĺ!Dţ‘_±%ţáőÁŃÜČĂu]ů\n" "ťÍőq–¤“n—ŻÖâˆç5‡>·\\ň{HRÂjE»\"ňéíń5”_~'Ř §ć$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®|\n" "D/o˝Ľ ő˛ŔČ_BU~ŔÔţŔÔţ„r´¶ZHč\"\n" "Ź`!ŕ\n" "] ˇˇ‹a# aK€„-¸p`Ú`ÚB—G_|Y eV\n" "šNšNʼn‰qL¬cž˜´üő«VŻYźś’šŇÚuKčútŻOç•2pĺÖĂ<śa ”lŔ™g„!ˇYŮ\"Îʆ>7Ů´ZŮ´™P\n" "-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\n" "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‹$ěŇd±Łěúíěu‡{ü_ bĄö\n" "endstream\n" "endobj\n" "1513 0 obj<</Outlines 1045 0 R/Metadata 1510 0 R/Pages 1483 0 R/StructTreeRoot 1128 0 R/Type/Catalog>>\n" "endobj\n" "1514 0 obj<</CropBox[0.0 0.0 612.0 792.0]/Parent 1485 0 R/StructParents 0/Contents 1516 0 R/Rotate 0/MediaBox[0.0 0.0 612.0 792.0]/Resources 1515 0 R/Type/Page>>\n" "endobj\n" "1515 0 obj<</ProcSet[/PDF]>>\n" "endobj\n" "1516 0 obj<</Length 39/Filter/FlateDecode>>stream\n" "H‰ŇH,*Q°±Ń÷uötQ0P°łsrqćĺâĺrőR  t\n" "z\n" "endstream\n" "endobj\n" "1 0 obj<</CropBox[0.0 0.0 612.0 792.0]/Parent 1485 0 R/StructParents 1/Contents 3 0 R/Rotate 0/MediaBox[0.0 0.0 612.0 792.0]/Resources 2 0 R/Type/Page>>\n" "endobj\n" "2 0 obj<</XObject<</Im1 4 0 R/Im2 5 0 R/Im3 6 0 R/Im4 7 0 R/Im5 8 0 R>>/Font<</F4 900 0 R>>/ProcSet[/PDF/Text/ImageC]/ExtGState<</GS1 902 0 R/GS2 903 0 R>>>>\n" "endobj\n" "3 0 obj<</Length 468/Filter/FlateDecode>>stream\n" "H‰tSÁnÓ@˝WÚ˜crčxgwíµEU)i*Zč*U=¸‰iM;Ř[\"řzĆö&D/¶4~ďÍ{3ăč:o<śťE‹‹ËH8?źÎ.ÄÉÔ‰č­÷Uâş~©Ta‰&LRp!‡đ,¦·˝»QđŘÂü–ën)N%J©ŔíÄčîĆÍÔýŘ}sĐĐßE¦PZ–ěŐlŠ¤3 Ú*T1˜Xa–H\n" "ËŤˆ.7łZ|ěďh+‰QĄ µAc:[› ÝőkÍI2ťˇ{Ś:I¤uĚâUSš«ˇyÇŃH2ĄŔ±¨¤Ň Ř.Q†6ł60ô‘Ł%“2Ć*ćŚl=aNŠĆš}Dsˆ¨LçWlŔ2*L˝›éäăd1ů>]ą.\n" "PęˇIĘŽţ3Š»‘{* _盼çŞöP¶ĂŞXÖMîËĹPlŠuî‹ř<ă·Mák„±˘^ \n" "ľdpYA>ľwďŮŢ)!ď}&FmY=® h}“W«7˝Ř?Í{ęĂOXŐ/kF÷˜ĎÎZhźęÝ®ęÄ»-nú-Wß…Ő2„í1<@–+ţŰkUřĘ˜Śjő ›Y4”ń($ľ@â<ZîŹ Ö#Nć ţQ~ 0 ΩĐg\n" "endstream\n" "endobj\n" "4 0 obj<</Subtype/Image/Length 4002/Filter/DCTDecode/Name/Im1/BitsPerComponent 8/ColorSpace/DeviceRGB/Width 92/Height 178/Type/XObject>>stream\n" "˙Ř˙î Adobe d€ ˙Ű „   \n" "\n" "\n\n" "\n\n" " \n\n" " #\"\"\"#''''''''''  \n" "  \n" " \n\n" "\n\n" "!! !!''''''''''˙Ŕ  ˛ \\\" ˙Ģ    \n" "     \n" "  s !1AQa\"q2‘ˇ±B#ÁRŃá3bđ$r‚ń%C4S’˘˛csÂ5D'“Łł6TdtĂŇâ&ƒ \n" "„”EF¤´VÓU(ňăóÄÔäôeu…•ĄµĹŐĺőfv†–¦¶ĆÖćö7GWgw‡—§·Ç×ç÷8HXhxˆ˜¨¸ČŘčř)9IYiy‰™©ąÉŮéů*:JZjzŠšŞşĘÚęú m !1AQa\"q‘2ˇ±đÁŃá#BRbrń3$4C‚’S%˘c˛ÂsŇ5âDƒT“ \n" "&6E'dtU7ňŁłĂ()Óă󄔤´ÄÔäôeu…•ĄµĹŐĺőFVfv†–¦¶ĆÖćöGWgw‡—§·Ç×ç÷8HXhxˆ˜¨¸ČŘčř9IYiy‰™©ąÉŮéů*:JZjzŠšŞşĘÚęú˙Ý  ˙Ú   ? 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0üĎ›ô‡›dÓő.,,˘ÓŇŢŇBŢŠµě˛¤łRµ’ŠŞ¬zd˙ ňľććëÉVw3Í,r]@F,ęÜË\n" "FĚ~ŃEPµöČ/ćĚ~ŹšRč9ipK¸člŻ˝Z·±őwůdżňžZůzöÓ•Ež©{ˇ*ĹČ7Ż­Ëé̉ů|dĚ‚}äţ§ţc $ň=Ŕ3¬Ľ¬ĽÇrËĘËĹZÍ›6*ŢV^V*ŢV^V*ŢV^V*˙ ˙Đ”~qŘĽ×:,Ę­ÔŽ—ϸ’ć–*ř˙ pŮ”Ż«u¬X1â/R×Y‚3±¬ń iúďđ´ ÷ýň?Í+7¸ňuŐäJZm&Hu8Ŕ©ÚŮĂËÓţ*çś×Č—‹¤ůĎNUn0ÉqwĄ=:îĐj6»/nC€Ě¨z´ÓŹó%Ĺřű\\izu—óă_Ź±ď™yYyŠäµ—•—Šµ›6lUĽ¬Ľ¬UĽ¬Ľ¬UĽ¬Ľ¬U˙Ńî÷¶ßŮÜXÜ/(.˘x%_‘J0űŽy™ŕżÓ¤6ĽˆÔôóőu¦Çëú<ž˝»/ßCżË=Aś?óGK}+ĚŇ_ÚGEÔ ]Jl\n" "ćžBN‚ť ÖĚ«ďľdidĚ)‚?sF¦$ŔHsń÷˝“HÔ Öt«-ZÔÖ Ř#¸ŹŮdPô?*ŕÜç?”zš>›¨hÁ]6ăײţXŠžĘćEú3Łe3‰ŚŚO8’>M±”D‡\"-¬Ľ¬Ľ‹&łfÍŠ·•—•Š·•—•Š·•—•Šż˙ŇďŮ üĎŇ$żňŮÔí#2_h’\n" "BQRń +s˙ ^o¦™4ĚĘaU;{ƒ„$6 Řř €A‘_<ů/YO.yŽĆĺ_ý’i×6V°˝<ě&'Ą!—÷uđ®z<ŮŻčiˇk7ş ĂŤĄ»›hÚ»ţŤż<ěÝ[­mćř+Ú‡;guŮ5˙ ,ÚOvܵZŮjC¸ą·>›±Řx {6dj@<cĘcíŠř4iÉXĄÎě?‹ř˛lĽ¬ĽĆrÍ›6*ŢV^V*ŢVnů±Vň˛ň±W˙ÓďŮyY‰\n" " 1 ’zŠĽÓówAI¬ŕó(RŃÚ+YjČ?jĆŕ€důÁ%ĺË!~JóŚ^OÖ$ý3#{ĺ6z‚Ä­#›ËTçmuH 0¸ƒá4xצIĽóů‘oygw¤h-iň†µĽÖ]DŃż5ŕĐXEżÖ·^_d•ś­M¦”ţŠ‚áŐ\"1#úÚ“«ńH–âĺżwj¦Ş(>ŚÍĂ K „ö‰ ‚yüÝńpňÎ1Ę%\n" "ä9|Oßđz®±ůżypÓ4Ȭcmă¸Ö&á#öŚvVÜäooŚl$o?yîĺąĹ|Č)ö-´°ˆ7ńľ““}v)ä?!/™4óŞË¨~‹€Ë$6rŹ­‰!n —W—G-°?\n" "ŤŹ\\ź[ţVy\n" "Ć›úBAÖ[ůeąbhH™Ůkň-463#Ľ×ăäĚGQ=ĚÄîřůĽń|÷çČ3ßHv'ŚÚZJ‡ţĺÓ†ú/ćć¦Ă«XĹ©˘źŽm4˜.Vź˝°»<˙ ŕ_čÉtż•ŢC’Ą4h퉭¬’ŰÓŻÄƒ—ż\\‰ůƒň–í!i´[żŇ±ÇşéÚ—\\-7úµúqtoĺç_ő†\"zil`qů‚OăäĽ:ˆî&'äE~>oFĐ<ÉŁůšĐÝé`ŤÂxXšţI˘z27Ěa®y–;­CFľ7ž˝Ĺ•í‹¤˝‘ w¶‡öcÔ\"űíO·Óőçtňo›Łó=¤‘\\˘ÚëD&ˇf¦ŁqđĎ-ĚRuSôu^\\& x˘yĚY„ý$pČs ź+/+)mo+/+˙") matches = re.finditer(regex, test_str) 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