const regex = /[a-zA-Z].+/gm;
const str = `!"343432aasd123_`;
let m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}

var regex = /([a-zA-Z].+)/gm;
var str = `!"343432aasd123_`;

var xx=regex.exec(st)(0)