1、 JS

let content = '烟花易冷人事易分 而你在问我是否还认真 千年后累世情深还有谁在等 ――《${name}》${time}'
var reg = /\$\{(\w+)\}/g
let variableArrey = content.match(reg)
console.log(variableArrey) 
VM456:7 (2) ["${name}", "${time}"]

• 结果

["${name}", "${time}"]

• 规则里的内容，重点：.replace(reg,'$1')

let content = '烟花易冷人事易分 而你在问我是否还认真 千年后累世情深还有谁在等 ――《${name}》${time}'
var reg = /\$\{(\w+)\}/g
let variableArrey = content.match(reg).map(item => item.replace(reg,'$1'))
console.log(variableArrey) 

• 结果

["name", "time"]

2、Golang

func TestReg(t *testing.T) {
    str := "${a}${b}"
    vars, err := getVar(str)
    if err != nil {
        t.Error(t)
        return
    }
    t.Log(convert.MustJsonString(vars))
}

func getVar(str string) (list []string, err error) {
    reg := regexp.MustCompile(`\${([^\${}]?)}`)

    if reg == nil {
        err = fmt.Errorf("正则表达式错误：%s", str)
        return
    }
    list = reg.FindAllString(str, -1)
    // list = > ["${a}","${b}"]
    for i, v := range list {
        list[i] = reg.ReplaceAllString(v, "$1")
    }
    return
}

• 结果

=== RUN   TestReg
--- PASS: TestReg (0.00s)
    math_test.go:131: ["a","b"]
PASS

Process finished with exit code 0