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"
"
g

Test String

Code Generator

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "x^"; final String string = "unavailable speedometer's garbling Zambia subcontracted fullbacks Belmont mantra's\n" + "pizzicatos carotids bitch Hernandez renovate leopard Knuth coarsen\n" + "Ramada flu occupies drippings peaces siroccos Bartók upside twiggier configurable perpetuates tapering pint paralyzed\n" + "vibraphone stoppered weirdest dispute clergy's getup perusal fork\n" + "nighties resurgence chafe\n" + "slop's overdosed clewing lidded superstition regale swisher jaundiced multiplexors Indiana's Marquis fisher's\n" + "weekend's millimeter Khalid's knowingly\n" + "Clyde diuretic raggedness's Socratic initialization pluralized swilling louver's Caedmon's outreach's return regression shortened azures ultra's point bumping\n" + "sidesaddle's waxen Brussels wrested currant's scented Ariadne whammy hypertext's patrimony's Sicilians why indivisibility eluded scrounged impaneled grimaced friction's\n" + "infringing Sardinia's Dyer Seder's\n" + "amaze's\n" + "beeping potters cauldron's carnival's parricides sellouts roomiest Buick's bingeing gently procure Darin's inheritor Doonesbury's baldest tomfoolery's democratizes donates wage's\n" + "pencil obscure Opel's cymbal's loggerhead's cubed inessential's enrapturing gypsy\n" + "Velveeta capitalists garnets Waikiki shticks stoat's shred's anneals columned river's continuum preferring beloveds Junes Flintstones\n\n" + "Buick's epaulette's legalized impecuniousness Apollonian esoterically attack fry's Hal some sweltered enduing astrological Sandy marble's chameleon reapportionment's\n" + "jeopardize Vaughn's antibodies carefully manifestation speakeasy's bookseller's\n" + "Freetown purplest japans Ruth audit Carr deceit schticks subservience kidnapper agrarians committal cashmere's Lanny's despondency stigmatizes Guiyang\n" + "mudslides grayness's Scotsmen recordings imparts windmilling cordite's worthlessness's tone\n" + "object uncommonest truism barbecued psychobabble's Lyndon's uncritical longevity shamefulness's overborne ulceration's\n" + "crud underweight's paginated phalli demonstratives indices deconstruction upright beetles stalemated Mediterranean surtax's sameness's pinafore piety purism truncation\n" + "satire jog Ward sullenness's counterclockwise portcullis's polyphony's aeration's injustices\n" + "geode's pouch's\n" + "charbroils crinoline advantaging nautilus's tangibility's progressing Evian copper sicken sublimates hoards\n" + "linseed's pheromone's approves clamor Henderson's tinkles demerit agonized Alec defrosting hotel\n" + "surveyors rib's African ghostwriting overrule sequoias Morales's whacks gantry alienable peddled\n" + "boardinghouses touts Slackware vindications rose's\n" + "morals acquaintances overreact cerebella Eu's blessedness's master palimony's perming mammalian's homophobic beefing fours sermonizes\n" + "Japura propagandists dulness momentous beer's cadaver's Kochab yawning Francoise's\n" + "dose's spike's plasterboard rendezvouses bitched nun's doodle hospitalize unwieldiness's torturer\n" + "abettor's predominantly tracker coagulation's shingle demoted lousiness\n" + "Trina poinsettias Wichita bellhops ammo's divinity's necking overcoming\n" + "physics backhoes rotary skylarks establishments adversity flood's\n" + "Bowery's tussled hoppers arachnid's Wilfred Gatling cranium ids salmonella\n" + "abdomens codeine's Urumqi mythology Macedonia's Kenmore's\n" + "trounces curses Comte faulting prefixes newel smugglers bawl's methodologies Max\n" + "tobogganing Olenek's adjudge loth\n" + "floaters update silence jiggers revolutionist sepulcher Formica's searchingly Cartesian Maya's halved hydrolysis McCullough's Zsigmondy badmouthed danced revolutionary slum's lanyards\n" + "repercussion's wrongfulness's earth's neonate Carmelo's\n" + "struggled heliports weathercock's appeasing pinched relegation weaned nappy\n" + "manganese deciduous ganged Mahayanist herbs individualizing repartee Albert aerators evolution monicker's electrifies Conner drooling Margret kibitzer excitation's Merriam's\n" + "misfortune ell determinations forever's trumpeting dreadfully voyeur's Markov noiselessly catechise cleaners muffler's gentleness's condense scholarship's Sang\n" + "Jeeves's Chappaquiddick's deodorants Tonia fixture preparations newsletter Nicola Stanton algorithms\n" + "honchos outspreading Kutuzov divulged\n" + "partition zinging Burnett cadge scrape's Poiret sulfured simplicity's inpatient's cottonwood sublease sublimate staled\n" + "mimicking disbarred shopping forgets jurist adulate bakery's pinkish atlases hatched encouraging flatware's talkers instrumentation negotiate refresher\n" + "Novosibirsk oblivious payment's widens\n" + "impoverishment's beehive's domination's etymologists virology Macon\n" + "humbugs inlaying truncheons downstream aesthetically substructure's fumigate Nannie afflicted Jr mimics pipsqueaks eBay's solid ague's\n" + "company herdsman misstates authorship pugnacity unlock flavor's Sn's longhand's trespass underscore Andean\n"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html