Java如何使用正则表达式查找指定字符串

public class FileTest {
    public static void main(String[] args) {
        String par1 = "params.txt";
        String par2 = "_depth.dep";
        String par3 = "_GRD.grd";
        String par4 = "_cs.dep";
        String par5 = "_Tide.txt";
        String par6 = "Jonswap.txt";
        while(true) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("please pressure a filename:");
            String next = scanner.next();
            if ("exit".equals(next)){
                break;
            }else if(par1.equals(next) || par2.endsWith(next) || par3.endsWith(next)
                    || par4.endsWith(next) || par5.endsWith(next) || par6.equals(next))
            {
                System.out.println("找到了你输入的文件：" + next);
            }else{
                System.out.println("没有找到！");
            }
        }
    }
}

.*_cs//.dep

.*_cs//.dep|.*_GRD.grd

public class RegexTest2 {
    public static void main(String[] args) {
        String regex = ".*_GRD\\.grd|.*_cs\\.dep|.*_depth\\.dep|" +
                ".*_Tide\\.txt|params\\.txt|Jonswap\\.txt";
        while(true){
            Scanner scanner = new Scanner(System.in);
            System.out.print("please preesure a fileName:");
            String next = scanner.next();
            if (next.matches(regex)){
                System.out.println("找到了：" + next);
            }else if("exit".equals(next)){
                System.out.println("byebye...");
                break;
            }else{
                System.out.println("没有找到！");
            }
        }
    }
}