正則表達式中的豎線

1，使用小括號與不使用括號作用相同，用來分隔多個正則表達式，表示或的意思；

let str1 = 'javascript|php';
let patt1 = /javascript|php/ig;
let arr1 = str1.match(patt1);
console.log(arr1);
//["javascript", "php"] 打印結果

 

let str2 = 'javascript|php';
let patt2 = /(javascript|php)/ig;
let arr2 = str2.match(patt2);
console.log(arr2);
//["javascript", "php"] 打印結果

2,在中括號內，豎線表示普通的字符，沒有任何含義

let str3 = 'javascript|php';
let patt3 = /[javascript|php]/ig;
let arr3 = str3.match(patt3);
console.log(arr3);
//["j", "a", "v", "a", "s", "c", "r", "i", "p", "t", "|", "p", "h", "p"] 打印結果