Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
gmi

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"[, ]*\b[db]+y?[iunb]{1,2}[okgbil]{1,3}[nhei]{1,2} *(\d)" test_str = ("27 gloonlara road, finglas, dulbin 11\n" "apt 3 block 10 gallery quay, grand canal square dublini 2\n" "17 block c doonbeg house, clare village, clare hall dublin17\n" "1 waverley terrace, kenilworth square, dublin6\n" "19 ardmore close, artane, dublin 5\n" "71 powers court, mount street, dublin2\n" "apartment 93, 20 christchurch place, dubin 8\n" "15 ebenezer terrace, donor avenue, inchicore dubllin 8\n" "54 burnell park avenue, castleknock, dubin 15\n" "351 bachelors walk, dublin1\n" "apt 43 st. anthony's walk, rialto, dublin8\n" "apartment33 block d, doolin house, clare village clare hall dublin17\n" "40 coolatree park, beaumont, bublin 9\n" "57 bellville, navan road, dublin15\n" "2 belgard close, tallaght, dublin24\n" "51 the coombe, dubliln 8\n" "21 walkinstown park, walkinstown, diblin 12\n" "apt 77 millpark, clondalkin, dublin 22\n" "71 tudor lawns, foxrock, dublni 18\n" "38 bayside crescent, sutton, dublin13\n" "5 bancroft close, tallaght, dublin 24\n" "apt 18 no 68 jervis street, dublin1\n" "8 the friary, bluebell, dublin12\n" "64 cremorne, terenure, dubin 6\n" "1 elmwood close, clonsilla, dublinn 15\n" "19 woodstown place, knocklyon, dubin 16\n" "11 monksfield heights, clondalkin, dublin22\n" "2 st. declans tce, marino, dublin3\n" "apartment 28, block a kilkee house, clare village clare hall dublin17\n" "33 tulla house, clare village, dubllin 17\n" "71 donnycarney road, whitehall, dubin 9\n" "46 casement park, finglas, dublin11\n" "15 block e3 ennis house, clare village, clare hall dublin17\n" "13 blarney park, kimmage, dubin 12\n" "47 ennis house, clare village clare hall, dublin17\n" "6 ennis house, clare village, dublin13\n" "30 newlands road, clondalkin, dubllin 22\n" "33 kings avenue, dubiln 3\n" "46 block e3 ennis house, clare village clare hall, dublin17\n" "69 churchwell road, belmayne, balgriffin dublin13\n" "64 st. davids park, artane, dublin 5\n" "11 cairnbrook avenue, carrickmines, dublin 18\n" "78 hunter's walk, hunterswood, ballycullen dubin 24\n" "no198, lower kimmage road, dublin6\n" "20 kelston drive, foxrock, dubllin 18\n" "no 5 swift hall carrickmines wood, brennanstown road dubiln 18\n" "32 ballytore road, rathfarnham park, dublin 14\n" "70 hillcrest park, glasnevin, dublin11\n" "4 st. patrick's cottages, rathfarnham, dbulin 14\n" "35 johnstown court, cabinteely, dublon 18\n" "28 ashford st, dublin 7\n" "32 villiers road, rathgar, dublin6\n" "apt 19 mellor court, 19-23 liffey street lower, duboin 1\n" "15 all saints road, raheny, dublin5\n" "64 saul road, crumlin, dublin12\n" "10 blackheath court, clontarf, dublin3\n" "11 grangeview close, clondalkin, dublin 22\n" "128 kildare road, crumlin, dublin12\n" "39 woodstown way, knocklyon, dublin16\n" "23 rothe abbey, kilmainham, dublin8\n" "50 collinswood, collins avenue, dublin9\n" "24 tritonville road, sandymount, dublin 4\n" "139 belmont park, raheny, dublin5\n" "1 deerhaven crescent, clonee, dublin15\n" "15 monastery heath square, clondalkin, dublin22\n" "15 brookwood park, artane, dublin 5\n" "300 navan road, dublin7\n" "17b merlyn park, ballsbridge, dunlin 4\n" "84 tritonville road, sandymount, dublbin 4\n" "16 windsor terrace, portobello, dublin8\n" "1 whitton road, terenure, diblin 6w\n" "1 eagle hill avenue, terenure road east, dubliln 6w\n" "25 gullistan cottages, rathmines, dublin6\n" "409 castleforbes square, upper mayor street, dublin1\n" "439 castleforbes square, upper mayor street, dublin1\n" "94 phibsboro road, phibsboro, dublin7\n" "45 shanglass road, whitehall, dublin9\n" "12 st bricins park, dubliin 7\n" "20 greenhills road, walkinstown, dubln 12\n" "112 malahide road, clontarf, dubiln 3\n" "55 mountshannon road, rialto, dublin8\n" "46 foster terrace, dubiln 3\n" "3 rosemount, malahide road, dubin 5\n" "4 castle avenue, upr churchtown road, dubliln 14\n" "188 bushy park house, templogue road, terenure dublin6\n" "11 greenlea park, terenure, dubln 6w\n" "54 wood dale view, ballycragh, dubln 24\n" "2 glenfield avenue, clondalkin, dublin 22\n" "34 grange manor drive, rathfarnham, dublin16\n" "33 monksfield grove, clondalkin, dublin22\n" "41 philipsburgh terrace, marino, dublin3\n" "85 bluebell road, bluebell, dublin12\n" "11 the garth kingswood heights, clondalkin, dublin22\n" "5 mount eagle grove, leopardstown heights, leopardstown dublin18\n" "34 donore road, south circular road, dublin8\n" "65 sutton park, sutton, dublin13\n" "51 briarfield road, kilbarrack, dubln 5\n" "4 drumfinn avenue, ballyfermot, dulin 10\n" "31 gullistan cottages, rathmines, dublin6\n" "40 pinewood park, rathfarnham, dubiln 14\n" "64 the waterside, charlotte quay, dublin4\n" "2 barnwell way, hansfield, dubin 15\n" "111 pine valley avenue, rathfarnham, dubkin 16\n" "30 ratra park, dublin 7\n" "3 blakestown road, mulhuddart, dubliln 15\n" "22 foyle road, fairview, dubln 3\n" "apt. 125 bachelor's walk, dublin 1\n" "31 summerhill parade, dulin 1\n" "88 meadow grove, dundrum, dubglin 14\n" "4 kickham road, inchicore, dublin 8\n" "52 hazelwood avenue, clonsilla, dublin15\n" "4 rathdown square, phibsboro, dublin 7\n" "14a kincora court, clontarf, dublin3\n" "apartment 26, 35 mountjoy square, dublin1\n" "3 drummartin crescent, goatstown, dublin 14\n" "15 the court, kingswood heights, dublin24\n" "78 greentrees road, perrystown, dublin12\n" "27 kiltipper avenue, tallaght, dubblin 24\n" "112 rafters road, drimnagh, dublin12\n" "3 barnwell terrace, hansfield, dubin 15\n" "40 the maples, clonskeagh, dublin 14\n" "48 alderwood, hollystown, dublin15\n" "43 millcourt avenue, clondalkin, dublin 22\n" "129 belmont park, raheny, dublin 5\n" "67 swanward court, parnell road, dublin 8\n" "111 whitethorn drive, palmerstown, dublin 22\n" "36 sundale avenue, tallaght, dublin24\n" "26 mount alton, knocklyon, dublin16\n" "41 kirkpatrick house, spencer dock, dublin1\n" "34 niall street, stoneybatter, dublin7\n" "59a foxrock park, foxrock, dublin18\n" "11 the cobbles, wellington quay, dublin2\n" "24 palmers court, palmerstown, dublin 20\n" "11 fernwood park, tallaght, dublin24\n" "28 the richmond, smithfield, dubln 7\n" "4 clogher road, crumlin, dublin 12\n" "8 sutton court, sutton, dubin 13\n" "19 st. marys road, dublin4\n" "6 butterfield avenue, rathfarnham, dublin16\n" "23 vernon gardens, clontarf, dublihn 3\n" "apartment 75, 109 parnell street, dublin1\n" "20 marian park, baldoyle, dublin13\n" "15 simmonscourt, ballsbridge, dublin4\n" "4 seaview terrace, howth, dublin13\n" "4 & ground floor 5 marino mart, fairview, dublin3\n" "119 bunting road, walkingtown, dublin12\n" "12 beau park, clongriffin, dublin13\n" "apt 1, 143 parnell st, dublin1\n" "apt 91 spencer house, custom house sq, dublin1\n" "7 beechpark avenue, castleknock, dublin15\n" "68 lighthouse gateway, east wall road, dublin3\n" "27a belvedere road, dublin1\n" "apartment 2, henrietta street, dunlin 2\n" "60 dublin rd, sutton, dubin 13\n" "6 millbrook village, milltown, dunlin6 dublin_6\n" "19b curzon street, dublin, dublin8\n" "39 claremont court, glasnevin, dubin 9\n" "aptment 48, harbour master square, ifsc dublin1\n" "22 willfield, sandymount, dublin4\n" "3 russell cresent, tallaght, dublin24\n" "apt. 4, 5 granby row, dublin1\n" "15 crumlin village, dubin 12\n" "167 hampton wood road, hampton wood, dubli 11\n" "25 hyde sq, south circular road, dubiln 8\n" "83 red arches road, baldoyle, dublin13\n" "276 bachelors walk, bachelors walk, dublin1\n" "1 the mews, dodder vale, churchtown dulbin 14\n" "21 annannamoe drive, annmoe, dublin7\n" "114 the northumberlands, lower mount st, dublin2\n" "11 the alders, carrington, santry dubllin 9\n" "111 marlborough road, donnybrook, dublin 4\n" "13 thomastown house, spencer dock, dublin1\n" "104 hampton wood avenue, hampton wood, dublin11\n" "19 red arches close, baldoyle, dublin13\n" "63 bannow road, cabra west, dubin 7\n" "10 greenfield park, donnybrook, dublin4\n" "12 glencarrig court, dublin9\n" "90 cushlawan park, tallaght, dubliln 24\n" "no 11 orlagh na green, templeogue, dublin16\n" "27 rocwood, foxrock, dubliln 18\n" "apt 22 parkgate place, parkgate street, dubln 8\n" "60 tenter fields, south brown street, dublin 8\n" "6 claremont, carrickmines, dublin18\n" "no.26 diswellstown manor, castleknock, dublin15\n" "no 79a talbot street and, 43 lower gardiner street, dublin1\n" "38 dobberbank, miltown, dublin6\n" "6 the courtyard, clonsilla, dublin 15\n" "6 court apartments, wilton place, dublin2\n" "628a south circular road, kilmainham, dulbin 8\n" "57 marlborough road, donnybrook, dublin4\n" "16 vernon drive, clontarf, dublin 3\n" "21 castlegrange avenue, castaheaney, dublin15\n" "95 grove park, rathmines, dubline 6\n" "1 eagle hill ave, terenure rd east, dubliln 6w\n" "ground floor, 52 south richmond st., dublin2\n" "43 tyrconnell road, inchcore, dyublin 8\n" "apt. 44, 16 kings inn street, dublin1\n" "wintergarden, dublin1, dublin_2\n" "3 dubber cross, finglas, dublin11\n" "4 parkside close, dublin 13\n" "16 ardilea crescent, clonskeagh, dubiln 14\n" "no 1 claremount, cornelscourt, dublin18\n" "28 grange hill, harolds grange road, dublin16\n" "10 garville drive, rathgar, dublin 6\n" "15 north richmond st, dubliin 1, dublin\n" "64 diswellstown way, castleknock, dublin15\n" "9 belarmine woods, stepaside, dubln 18\n" "4 belarmine woods, stepaside, dublin 18\n" "88 stepaside park, stillorgan, dublin18\n" "south earl house, south earl street, dbulin 8\n" "apartment 20, 18-21 mount street lower, dublin2\n" "40a cashel avenue, crumlin, dublin12\n" "18 whitestown green, blanchardstown, dublin15\n" "52 kingscourt, parnell street, dublin1\n" "no. 8 tenenure gate, terenure, dubllin 6w\n" "26 strandmill avenue, portmarnock, dublin13\n" "unit 63, northbank castleforbes road, dublin1\n" "unit no 46 2nd floor, north bank castleforbes road, dublin1\n" "unit no. 136 second floor, northbank castleforbes road, dublin1\n" "unit no. 33, fourth floor, northbank castleforbes road dublin1\n" "75 wellview avenue, blanchardstown, dublin15\n" "apartment 140 rathmines town centre, rathmines, dubin 6\n" "unit 25 seascape, 366 clontarf road, dublin3\n" "1 priory street, clongriffin, dublin13\n" "apartment no 10 smithfield lofts, north king street, dublin 7\n" "23 hampton wood lawn, hampton wood, dublin11\n" "25 parslickstown green, mulhuddart, dublin15\n" "10 bluebell rd, bluebell, dublin 12\n" "42 glasnevin avenue, glasnevin, dublin9\n" "8 orwell park gardens, rathgar, dublin6\n" "66 wellview avenue, blanchardstown, dublin15\n" "4 ely square, rathfarnham, dublni 14\n" "104a howth road, clontarf, dublin3\n" "385 trimbleston, goatstown road, dublin14\n" "44 parslickstown green, mulhuddart, dublin15\n" "16 mountjoy square, dublin1\n" "10 hogan place, dublin2, dublin\n" "39 blackberry hill, carrickmines, dublin 18\n" "52 kennelsfort rd upr, palmerstown, dulin 20\n" "19 sheepmoor grove, blanchardstown, dublin15\n" "39 parslickstown avenue, mulhuddart, dublin15\n" "unit 8 seascape, 366 clontarf road, dublin3\n" "14 wellview grove, blanchardstown, dublin15\n" "apt 19 mellor court, 19 23 liffey st lower, duboin 1\n" "26 dal riada court, knocklyon, dublin16\n" "25 drumcliffe drive, dublin, dbulin 7\n" "3 whitestown green, blanchardstown, dublin15\n" "28 dermot street, clongriffin, dublin13\n" "30 swift hall, the coombe, dublin 8\n" "144 hampton wood avenue, dublin, dublin11\n" "27a belvedere road, dublin1\n" "18 maxwell road, rathmines, dublin6\n" "apartment 35 seascape, 366 clontarf road, dublin3\n" "17 odins way, rathfarnham, dublion 16\n" "178 batchelor walk, dbulin 1\n" "39 rialto cottages, rialto, dublin8\n" "7 coolatree rd, beaumont, dublin9\n" "36 orlagh grange, knocklyon, dublin 16\n" "3 bluebell crescent, bluebell avenue, dublin12\n" "4 bluebell crescent, bluebell avenue, dublin12\n" "5 bluebell crescent, bluebell avenue, dublin12\n" "27 wellview avenue, blanchardstown, dublin15\n" "6 millrace gardens, saggart, dublin24\n" "dass 117 foxrock grove, dulbin 18\n" "45 seascape, 366 clontarf road, dublin3\n" "20 tara hill rd, rathfarnham, dublin14\n" "5 the ropery, south lotts road, dublin4\n" "69 palmerston rd, rathmines, dublin 6\n" "40 castlegrange avenue, castlegrange, dublin15\n" "apt 1, 12 adelaide road, dublin2\n" "22 wellview park, blanchardstown, dublin15\n" "8 grattan place, dublin2\n" "4 seascape, clontarf road, dublin3\n" "38 dobberbank, miltown, dublin6\n" "aptment 48, harbour master square, ifsc dublin1\n" "41a ballyboden crescent, rathfarnham, dublin16\n" "59 seascape, clontarf, dublin3\n" "180 st. margarets road, hampton wood, dublin11\n" "76 whitestown park, blanchardstown, dublin15\n" "15 barnwell grove, hansfield, dublin 15\n" "67 glenealy road, crumlin, dublin12\n" "3 rock ville court, glenamock road, dublin18\n" "apartment 1, 314 south circular road, dublin 8\n" "53 hollywood rath avenue, hollystown, dublin15\n" "7 whitestown grove, blanchardstown, dublin15\n" "68 lighthouse gateway, east wall road, dublin3\n" "23 dodderbrook avenue, ballycullen, dublin24\n" "1 airpark square, rathfarnham, dublin16\n" "47 fairhaven avenue, castleknock, dublin15\n" "18 edenbrook green, citywest, dublin24\n" "88 park drive ave, castleknock, dublin15\n" "1 de burgh rd, dublin7, dublin\n" "apt1, 6 sherrard street upper, dubiln 1\n" "apartment 7, 55 percy place, dublin4\n" "18 (f) south lotts road, ringsend, dublin4\n" "the kokonut, 6 long mile road, dublin 12\n" "15 riverwood square, castleknock, dublin15\n" "6 elder heath court, elder heath, dublin24\n" "29 churchfields, milltown, dunlin 6 dublin_6\n" "8 wellview avenue, blanchardstown, dublin15\n" "39 sheepmoor grove, blanchardstown, dublin15\n" "9 abbotts grove avenue, knocklyon, dublin16\n" "5 hollywoodrath avenue, hollystown, dublin15\n" "7 carlton mews, shelbourne avenue, dublin 4\n" "apartment 2, henrietta street, dunlin 2\n" "flat 1, 11 north frederick street, dublin1\n" "25 hyde sq, south circular road, dubiln 8\n" "17 parslickstown avenue, mulhuddart, dublin15\n" "25 hollywoodrath crescent, hollystown, dublin15\n" "36 fairhaven walk, castleknock road, dublin15\n" "1 whitechapel grove, coolmine, dublin15\n" "89 the old distillery, beresford st, dublin7\n" "8 castleknock cross, castleknock, dubin 15\n" "apt 1, 18 synge st, dubli 8\n" "1b sheepmoor close, blanchardstown, dublin15\n" "4 hollywoodrath road, hollystown, dublin15\n" "no. 125 hampton wood avenue, hampton wood, dublin11\n" "39 malahide road, clontarf, dubllin 3\n" "36 fairhaven road, castleknock, dublin15\n" "36 hampton wood lawn, finglas, dublin11\n" "414 trimbleston, goatstown road, dublin14\n" "11 maxwell square, rathmines, dublin6\n" "57 moyclare close, baldoyle, dublin13\n" "125 brandon square, blanchardstown, dublin15\n" "2 cuil duin row, citywest, dublin24\n" "44 parslickstown drive, mulhuddart, dublin15\n" "2 king street, clongriffin, dublin13\n" "9 the drive, bellingsmore, church road kilmartindublin15\n" "apartment 115, longboat quay north, dublin2\n" "7 diswellstown grove, castleknock, dublin15\n" "34 portersgate avenue, clonsilla, dublin15\n" "30 temple woods, greenhills road, dublin24\n" "12 park house, baldoyle, dublin13\n" "4 castle avenue, upper churchtown rd, dubliln 14\n" "16 fairhaven close, castleknock, dublin15\n" "apartment 60 ard cluain, main street clonee, dublin 15") matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE) 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