正則如何匹配出字符串中的特定字符？

/content/dam/sonystyle/products/color/([^\/]*)[$|/].*$

個(gè)人感覺沒有必要使用正則

let str = '/content/dam/sonystyle/products/color/silver/color_icon_grey_30x30.gif'
let len = '/content/dam/sonystyle/products/color/'.length
str = str.slice(len) // str = 'silver/color_icon_grey_30x30.gif'
str = str.split('/') // str = ['silver', 'color_icon_grey_30x30.gif']
str = str[0] // str = 'silver'

function getKey() {
    const reg = /\/content\/dam\/sonystyle\/products\/color\/([^\/]+)\/.+/;
    const res = reg.exec('/content/dam/sonystyle/products/color/silver/color_icon_grey_30x30.gif');
    return res && res[1];
}

var a = "/content/dam/sonystyle/products/color/silver/color_icon_grey_30x30.gif"
var reg = /\/content\/dam\/sonystyle\/products\/color\/([^\/]+)/;
var v = reg.exec(a)[1];
console.log(v);