HarmonyOS字符串替换问题

@Preview 
@Entry 
@Component 
struct PreviewPage { 
  @State text:string = 'this is a test' 
  change(){ 
    let regex:RegExp = new RegExp('is','g') 
    this.text = this.text.replace(regex,'at') 
  } 
  build() { 
    Column(){ 
      Text(this.text) 
        .onClick(()=>{ 
          this.change() 
        }) 
    } 
  } 
 
}