Regular Expressions 101

Save & Manage Regex

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Function

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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
Processing...

Test String

Code Generator

Language

Generated Code

$re = '/((https?)?([^\/])*)/i'; $str = 'http://www.christianliferesources.com/links.html google.com http://dhhs.ne.gov/publichealth/Pages/hew_hpe_nebraskacares_resources.aspx http://www.babysittersguide.mobi/resources/links.php http://www.lifeslittletreasures.org.au/prematurity/useful-links/ http://www.rms.org.uk/outreach/index/WebLinks http://www.cellbiolabs.com/links-resources http://nationalcmlsociety.org/resources/cml-and-leukemia-links http://lifeslittletreasures.org.au/prematurity/useful-links/ https://www.aps-spr.org/resources/helpful-links.asp http://www.womeningovernment.org/oncology/hpv/resources/online http://www.lymphoma.ca/lymphoma/resources/helpful-links http://www.nationalcmlsociety.org/resources/cml-and-leukemia-links https://www.lymphoma.ca/lymphoma/resources/helpful-links http://www.cyagen.com/us/en/resources/useful-links.html http://womeningovernment.org/oncology/hpv/resources/online http://www.citykinder.com/for-parents-to-be/links-we-like/ https://www.womeningovernment.org/oncology/hpv/resources/online http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=89 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272 http://www.christianliferesources.com/links.html?print=1 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=88 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=88 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=88 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=268 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=263 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=268 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=266 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=90 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=86 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=263 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=94 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=94 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=86 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=265 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=85 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=263 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=266 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=264 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=87 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=91 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=92 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=91 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=87 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=263 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=94 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=94 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=86 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=267 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=264 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=265 http://www.transfusionmedicine.ca/resources/links/Web-Links http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=264 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=93 http://www.easierparenting.com.au/resources/useful-links/ http://www.swedishamerican.org/services/cancer_care/links/ http://chd.org/adult-services/community-based-programs/cancer-house-hope/helpful-linksresources/ http://www.aps-spr.org/resources/helpful-links.asp http://www.cyagen.com/us/ja/resources/useful-links.html https://www.transfusionmedicine.ca/resources/links/Web-Links http://www.communityoptions.ab.ca/resources/helpful-links https://www.lifeslittletreasures.org.au/prematurity-resources/useful-links/ http://www.lifeslittletreasures.org.au/prematurity-resources/useful-links/ https://www.rmhca.org/family-resources/helpful-links-for-families/ http://lifeslittletreasures.org.au/prematurity-resources/useful-links/ http://www.americantransplantfoundation.org/about-transplant/resources-and-links/other-organizations/ http://perinatalresources.org/medical-education-links/ http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=268 http://www.losninos.com/resources/helpful-links/ http://swedishamerican.org/services/cancer_care/links/ http://fitwise.com.au/patient-resources/links-page http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=87 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=91 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=90 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=91 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=89 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=266 http://tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=93 http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=88 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=90 http://www.tipslimited.co.uk/index.php?option=com_weblinks&view=weblink&id=272&Itemid=93 http://www.hospicegiving.org/resources-links http://www.transfusionmedicine.ca/resources/links/web-links/itranfuse-australian-red-cross-blood-service http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=85 http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=90 http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=92 http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=87 http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=84 http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=84 http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=267 http://tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=81 http://www.tipslimited.co.uk/index.php?view=weblink&catid=93%3Acord-blood-banking&id=272%3Acordbloodbankingcom&option=com_weblinks&Itemid=81 http://www.choicespregnancypartners.org/national-affiliates https://www.choicespregnancypartners.org/national-affiliates http://www.transfusionmedicine.ca/resources/links/web-links/cord-blood-center https://www.transfusionmedicine.ca/resources/links/web-links/cord-blood-center http://advantacare.net/Resource-Center/Medical-Web-Sites http://www.ncpeid.org/index.php/links-resources http://www.transfusionmedicine.ca/fr/resources/links/Web-Links https://www.transfusionmedicine.ca/fr/resources/links/Web-Links http://www.idahoperinatal.org/links.php http://www.transfusionmedicine.ca/resources/links/web-links/american-association-blood-banks-aabb https://www.transfusionmedicine.ca/fr/resources/links/web-links/itranfuse-australian-red-cross-blood-service http://ncpeid.org/index.php/links-resources/for-parents http://www.transfusionmedicine.ca/fr/resources/links/web-links/american-association-blood-banks-aabb http://www.transfusionmedicine.ca/fr/resources/links/web-links/itranfuse-australian-red-cross-blood-service https://www.transfusionmedicine.ca/resources/links/web-links/itranfuse-australian-red-cross-blood-service http://ncpeid.org/index.php/links-resources http://idahoperinatal.org/links.php http://www.soulchoice.org/links.html http://www.soulchoice.org/online-resources-and-helpful-links.html http://www.horsepowerforlife.org/resources/useful-links/ http://www.fertilityresourceshouston.com/additional-information/helpful-links.aspx http://www.horsepowerforlife.org/index.php/resources/useful-links/ http://www.sri-online.org/links/educational-resources http://www.rmhca.org/family-resources/helpful-links-for-families/ https://perinatalresources.org/medical-education-links/ http://aohna.org/resources-links/ohn-resources http://ichpcolorado.com/services/Links_to_National_Health_Care_Resources.htm http://www.healthystartbfg.com/Resources-Links.aspx http://healthystartbfg.com/Resources-Links.aspx http://www.ichpcolorado.com/services/Links_to_National_Health_Care_Resources.htm http://tkeckle.net/links/medical.html http://leavenfortheloaf.com/links/crisis-pregnancy-resources-in-nh/comment-page-1/#comments http://leavenfortheloaf.com/links/crisis-pregnancy-resources-in-nh/ http://www.fitwise.com.au/patient-resources/links-page http://www.parentingmatters-epc.org/parent-resources-support/helpful-links/ http://www.lifeslittletreasures.com.au/prematurity/useful-links/ http://leukodystrophyresourceresearch.org/resources-news/useful-links/ http://www.centralvalleymedicalcenter.com/resources/helpful-links https://www.achancetogrowfilm.com/resources/resource-links/ http://wallofcourage.com/links/index.htm http://www.wallofcourage.com/links/index.htm http://myoc3.org/directory/catalog/companies/293?task=companies.showCompanyWebsite http://www.myoc3.org/component/jbusinessdirectory/companies/293?task=companies.showCompanyWebsite http://myoc3.org/component/jbusinessdirectory/companies/293?task=companies.showCompanyWebsite http://www.arearlylearning.org/index.php/parents/parent-links/12 http://www.designedtobirth.com/links-books-and-resources.html http://www.myoc3.org/directory/catalog/companies/293?task=companies.showCompanyWebsite http://frontrangeobgyn.com/resources/links/ http://arearlylearning.org/index.php/parents/parent-links/12 http://www.arearlylearning.org/index.php/parents/parent-links?task=weblink.go&id=12 http://movingbeyondcancer.com.au/useful-links?task=weblink.go&id=14 http://www.motherandbabymatters.com/resources.html http://arearlylearning.org/index.php/parents/parent-links?task=weblink.go&id=12 http://au.sascentre.com/resources/1323 http://int.sascentre.com/resources/1323 http://uk.sascentre.com/resources/1323 http://www.koruselfdevelopment.com/index.php/links/16 http://koruselfdevelopment.com/index.php/links/16 http://msoncologysociety.org/links-resources.php http://www.msoncologysociety.org/links-resources.php http://www.lifeslittletreasures.com.au/prematurity-resources/useful-links/ http://momchd.com/parenting-links-and-resources/ http://flintobgyn.com/patient-resources/links/ http://www.oxfordobgyninc.com/resources/related-links http://livehealthysiouxland.org/web-links/8-prevention/73-cord-blood-banking.html http://www.livehealthysiouxland.org/web-links/8-prevention/73-cord-blood-banking.html http://getready4baby.com/links.html http://www.getready4baby.com/links.html http://jesperson.se/test1/magpierss/scripts/cache/43521fb1322467036d3b55ea1d37a921 http://jesperson.se/test1/magpierss/scripts/cache/43521fb1322467036d3b55ea1d37a921 '; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php