How to extract a number from a string [duplicate]

问题:

This question already has an answer here:

• Extract digits from a string in Java 13 answers

I am writting an application whereby to reset a password you will be sent an sms containing a reset code to confirm you as the owner of the account.. But am trying to build the app in such a way that it receives the broadcast of the received sms and get the specified integer only from the sms body. Sample of the sms We noticed you want to reset your password. Password reset code is 3242., Thanks

i like to get just the reset code=3242 from the whole sms body.. Thanks.

回答1:

Use regex as

  String number = body.replaceAll("\\D+","");

Or use a regex such as [^0-9] to remove all non-digits as

String number  = body.replaceAll("[^0-9]", "");