Java正则表达式模式匹配正向

Question

I've create a regular expression to match

• user_ent_mov
• user_ent_mov_123
• user_mov_ent123

But it shouldn't match

• user_ent
• user_ent123
• user_mov123

My Regual Expression

^user_(?:ent(?=_mov)|mov(?=_ent)).*$

Everything is working fine. But when I run exhaustive tests my regx fails.

Any suggestions would be greatly appreciated.

PS: I've pre-compiled my regex and its not declared static.

Answer 1

Keep it simple.

user_(ent_mov|mov_ent)_?\d*

DEMO

use String#matches() to check for matches.

String regex="user_(ent_mov|mov_ent)_?\\d*";

System.out.println("user_ent_mov".matches(regex));    //true
System.out.println("user_ent_mov_123".matches(regex));//true
System.out.println("user_mov_ent123".matches(regex)); //true
System.out.println("user_ent".matches(regex));        //false
System.out.println("user_ent123".matches(regex));     //false
System.out.println("user_mov123".matches(regex));     //false