let myStr = " Hello World! " let myRegex = /Hello/ myRegex . test ( myStr ) // true let myRegex2 = /hello/ myRegex2 . test ( myStr ) // false let myRegex3 = /hello/i myRegex3 . test ( myStr ) // true myStr . match ( myRegex ) // "Hello" let myStr2 = " Hello World! hello " let myRegex4 = /Hello/ig myStr2 . match ( myRegex4 ) // ["Hello,"hello"] Enter fullscreen mode Exit fullscreen mode Match Anything with Wildcard Period let humStr = " I'll hum a song " ; let hugStr = " Bear hug " ; let huRegex = /hu./ ; huRegex . test ( humStr ); // true huRegex . test ( hugStr ); // true Enter fullscreen mode Exit fullscreen mode Match Single Character with Multiple Possibilities let bigStr = " big " ; let bagStr = " bag " ; let bugStr = " bug " ; let bogStr = " bog " ; let bgRegex = /b [ aiu ] g/ ; bigStr . match ( bgRegex ); // ["big"] bagStr . match ( bgRegex ); // ["bag"] bugStr . match ( bgRegex ); // ["buig"] bogStr . match ( bgRegex ); // null Enter fullscreen mode Exit fullscreen mode let quoteSample = " Beware of bugs in the above code; I have only proved it correct, not tried it. " ; let vowelRegex = / [ aeiou ] /ig ; let result = quoteSample . match ( vowelRegex ); // [ 'e', 'a', 'e', 'o', 'u', 'i', 'e', 'a', 'o', 'e', 'o', 'e', 'I', 'a', 'e', 'o', 'o', 'e', 'i', 'o', 'e', 'o', 'i', 'e', 'i' ] Enter fullscreen mode Exit fullscreen mode Match Letters of the Alphabet let catStr = " cat " ; let batStr = " bat " ; let matStr = " mat " ; let bgRegex = / [ a-e ] at/ ; catStr . match ( bgRegex ); //["cat"] batStr . match ( bgRegex ); //["bat"] matStr . match ( bgRegex ); //null Enter fullscreen mode Exit fullscreen mode let quoteSample = " The quick brown fox jumps over the lazy dog. " ; let alphabetRegex = / [ a-z ] /ig ; let result = quoteSample . match ( alphabetRegex ); //[ 'T', 'h', 'e', ... ,'d', 'o', 'g' ] Enter fullscreen mode Exit fullscreen mode Match Numbers and Letters of the Alphabet let jennyStr = " Jenny8675309 " ; let myRegex = / [ a-z0-9 ] /ig ; jennyStr . match ( myRegex ); Enter fullscreen mode Exit fullscreen mode let quoteSample = " Blueberry 3.141592653s are delicious. " ; let myRegex = / [ h-s2-6 ] /ig ; let result = quoteSample . match ( myRegex ); Enter fullscreen mode Exit fullscreen mode Match Single Characters Not Specified let quoteSample = " 3 blind mice. " ; let myRegex = / [^ aeiou0-9 ] /ig ; let result = quoteSample . match ( myRegex ); Enter fullscreen mode Exit fullscreen mode Match Characters that Occur One or More Times let difficultSpelling = " Mississippi " ; let myRegex = /s+/g ; let result = difficultSpelling . match ( myRegex ); //[ 'ss', 'ss' ] Enter fullscreen mode Exit fullscreen mode Match Characters that Occur Zero or More Times let chewieQuote = " Aaaaaaaaaaaaaaaarrrgh! " let chewieRegex = /Aa*/ ; let result = chewieQuote . match ( chewieRegex ); // ['Aaaaaaaaaaaaaaaa'] Enter fullscreen mode Exit fullscreen mode 
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