JAVASCRIPT

javascript regex .test

const str = 'hello world!';
const result = /^hello/.test(str);

console.log(result); // true

/**
The test() method executes a search for a match between 
a regular expression and a specified string
*/

javascript regex test match

// .test(string) is a method of the RegExp class
//   returns a boolean value
// .match(regexp) is a method of the String class
//   if global flag (g) is included, returns an array of matched instances

const str = "A text string!";
const reg = /t/g; // matches all lower case "t"s

reg.test(str); // returns true
str.match(reg); // returns ['t', 't', 't']

JavaScript RegExp test()

 let text = "abcdefghijklmnopqrstuvxyz";
 let pattern = /e/;
 pattern.test(text)
/*searches for pattern in text*/