如何在 javascript 中使用正则表达式从另一个字符串中获取特定字符串

Question

My sample code:

let str = 'myname:is:gopal@gmail.com';
console.log(str.match(":" + "(.*)" + "@")[1]));

returns for above regex => is:gopal // returned value

expected output is => gopal // i want only *gopal*

Note: all the strings are dynamic, except : and @ these special characters.

Thanks in advance.

Answer 1

Positive Lookahead and Positive Lookbehind can solve your problem.

UPD : match non-word characters (by @toto)

s = 'myname:is:gopal@gmail.com'
s.match(/(?<=:)[^:]+(?=@)/)
// --> ["gopal", index: 10, input: "myname:is:gopal@gmail.com", groups: undefined]

regex101 test here

Answer 2

Many thanks @Mandy8055

let str = "myname:is:gopal@gmail.com";
console.log(str.match('.*:(.*)@.*')[1]); // returns gopal