Please enable JavaScript to use regex101
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Regular Expression
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^([A-Z](([A-Z]{1,2}[a-z0-9]+)+([A-Z]{1,3}[a-z0-9]+)*[A-Z]{0,3}|([a-z0-9]+[A-Z]{0,3})*|[A-Z]{1,2}))$|^([a-z][a-z0-9]*(([A-Z]{1,3}[a-z0-9]+)*[A-Z]{0,3}|([a-z0-9]+[A-Z]{1,3})*|[A-Z]{1,3}))$
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gm
Input 1
1
ABCD ABCDE MdeADFAFdsADFads DeviceSNSD AabcABCD ABabcABCD ABabcABCDabcABCD ABCabcABCD ABCabcABCDabcABCDabcABCDabcABCD ABCDabcABCD ABCDabcABCDabcABCDabcABCDabcABCD HTMLParser ContextHTMLParser ABCDabcABC ABCDabcAB ABCDabcA CamelCa_1 HELLO snake_case 2PascalCase streamIOIO gREATERDtha modeADFAFdsADFads camelCa_1 contextHTMLParser hELLO AabcABCDabcABC AabcABCDabcABCD AabcABCabcABCD ABabcABCDabcABC ABabcABCDabcABCD ABabcABCabcABCD aBabcABCDabcABC aBabcABCDabcABCD aBabcABCabcABCD ababcABCDabcABC ababcABCDabcABCD ababcABCabcABCD SerialNO serialNo context camelCasE aGa alphabet serialNO modeADFdsADFads streamIO aBCabcABCabcA aBCabcA aabc123 aabcABC ab abc abcd abcde deviceSNS pathASNs dscpCP awsVPC deviceID camelCasecamelCasecamelCasecamelCasecamelCasecamelCase gREA1 gREAt gREAtREAt cP3 a1 aABC a123 modeADFsADFads a1G aG a modeADFads camelCase lThan30DaysCount lessThan30DaysCount lessThan30DaysCountA greaterThan30LessThan60DaysCount greaterThan60LessThan90DaysCount greaterThan90DaysCount pascalCase pascal2Case pascalCaseA pascal2CaseA modeA mode2A mode2A2 mode2A2A createAMode createBMode madeEasy wonderFul andMe htmlParser h aaA camel01C camel01c01 camel01C01 camel01CC01 camel0a1c1 camel0a1C1 camel0ac1b1C1 camelC camelC1 camelCA camelCa1 ibsReleaseTestVerificationRegressionSuite ibsReleaseTestVerificationRegressioNSuite ibsReleaseTestVerificationRegressioN xmlHttpRequest newCustomerId innerStopwatch supportsIpv6OnIos youTubeImporter youtubeImporter affine3D Ag ABCabcABCabc AwsVPC AaABC PacalCasePacalCasePacalCasePacalCasePacalCasePacalCase AabcABCabcABC MoeADFdsADFads ABCabcABC ABCabcAB ABabcABC ABabcAB AabcAB ABCabcABCabcA ABCabcA Aabc123 AabcABC A AB ABC StreamIO IOStream DeviceID DeviceSNS Context PascalCase Pascal2Case PascalCaseA Pascal2CaseA ModeA Mode2A Mode2A2 Mode2A2A CreateAMode CreateBMode MadeEasy WonderFul AndMe HtmlParser H AaA Camel01C Camel01c01 Camel01C01 Camel01CC01 Camel0a1c1 Camel0a1C1 Camel0ac1b1C1 CamelC CamelC1 CamelCA CamelCa1 IbsReleaseTestVerificationRegressionSuite IbsReleaseTestVerificationRegressioNSuite IbsReleaseTestVerificationRegressioN XmlHttpRequest NewCustomerId InnerStopwatch SupportsIpv6OnIos YouTubeImporter YoutubeImporter Affine3D
Substitution
ABCD ABCDE MdeADFAFdsADFads DeviceSNSD AabcABCD ABabcABCD ABabcABCDabcABCD ABCabcABCD ABCabcABCDabcABCDabcABCDabcABCD ABCDabcABCD ABCDabcABCDabcABCDabcABCDabcABCD HTMLParser ContextHTMLParser ABCDabcABC ABCDabcAB ABCDabcA CamelCa_1 HELLO snake_case 2PascalCase streamIOIO gREATERDtha modeADFAFdsADFads camelCa_1 contextHTMLParser hELLO AabcABCDabcABC AabcABCDabcABCD AabcABCabcABCD ABabcABCDabcABC ABabcABCDabcABCD ABabcABCabcABCD aBabcABCDabcABC aBabcABCDabcABCD aBabcABCabcABCD ababcABCDabcABC ababcABCDabcABCD ababcABCabcABCD SerialNO serialNo context camelCasE aGa alphabet serialNO modeADFdsADFads streamIO aBCabcABCabcA aBCabcA aabc123 aabcABC ab abc abcd abcde deviceSNS pathASNs dscpCP awsVPC deviceID camelCasecamelCasecamelCasecamelCasecamelCasecamelCase gREA1 gREAt gREAtREAt cP3 a1 aABC a123 modeADFsADFads a1G aG a modeADFads camelCase lThan30DaysCount lessThan30DaysCount lessThan30DaysCountA greaterThan30LessThan60DaysCount greaterThan60LessThan90DaysCount greaterThan90DaysCount pascalCase pascal2Case pascalCaseA pascal2CaseA modeA mode2A mode2A2 mode2A2A createAMode createBMode madeEasy wonderFul andMe htmlParser h aaA camel01C camel01c01 camel01C01 camel01CC01 camel0a1c1 camel0a1C1 camel0ac1b1C1 camelC camelC1 camelCA camelCa1 ibsReleaseTestVerificationRegressionSuite ibsReleaseTestVerificationRegressioNSuite ibsReleaseTestVerificationRegressioN xmlHttpRequest newCustomerId innerStopwatch supportsIpv6OnIos youTubeImporter youtubeImporter affine3D Ag ABCabcABCabc AwsVPC AaABC PacalCasePacalCasePacalCasePacalCasePacalCasePacalCase AabcABCabcABC MoeADFdsADFads ABCabcABC ABCabcAB ABabcABC ABabcAB AabcAB ABCabcABCabcA ABCabcA Aabc123 AabcABC A AB ABC StreamIO IOStream DeviceID DeviceSNS Context PascalCase Pascal2Case PascalCaseA Pascal2CaseA ModeA Mode2A Mode2A2 Mode2A2A CreateAMode CreateBMode MadeEasy WonderFul AndMe HtmlParser H AaA Camel01C Camel01c01 Camel01C01 Camel01CC01 Camel0a1c1 Camel0a1C1 Camel0ac1b1C1 CamelC CamelC1 CamelCA CamelCa1 IbsReleaseTestVerificationRegressionSuite IbsReleaseTestVerificationRegressioNSuite IbsReleaseTestVerificationRegressioN XmlHttpRequest NewCustomerId InnerStopwatch SupportsIpv6OnIos YouTubeImporter YoutubeImporter Affine3D