Regex \b word boundary not works

问题

In Android I have the next regexp \b(id)\b,

In this query (i.e.) I want replace exactly the word 'id' :

SELECT schedules.id as 'idreal' FROM schedules WHERE schedules.id = 12;

Final query:

SELECT schedules._id as 'idreal' FROM schedules WHERE schedules._id = 12;

But it doesn't work, the \b is for word boundary, but it doesn't work. What i'm doing groing?

This is my code:

Matcher matcher = Pattern.compile("\b(id)\b").matcher(field);
String query = matcher.replaceAll("_id");

Log.v(TAG, "Clean Query: "  + query);

I tested in

Thanks a lot.

回答1:

You should escape \ to represent \ literally. Otherwise \b means a backspace characters.

Matcher matcher = Pattern.compile("\\b(id)\\b").matcher(field);

来源：https://stackoverflow.com/questions/25938990/regex-b-word-boundary-not-works