how to extract a number from a String using regex

Question

I want to extract 12345 Rial from the String s :

String regx= ".* (\\d*) Rial";
String  s = "your balance is 12345 Rial your last"
Pattern pattern = Pattern.compile(regx);
Matcher matcher = pattern.matcher(s);
System.out.println(matcher.group(1));

but the following exception is being thrown

java.lang.IllegalStateException: No match found
 at java.util.regex.Matcher.group(Unknown Source)
 at ir.dena.avl.server.util.modbus.ChargeMessage.getBalanceFromIranCell(ChargeMessage.java:95)

Can anyone point out why?

Do you want to extract both the number and the adjacent word in the same regex? — luchosrock
– luchosrock, Commented Jun 18, 2014 at 15:22

Pshemo · Accepted Answer · 2014-06-18 15:23:30Z

1

Pattern first needs to be found before you will be able to use it. You need to use either find or matches first methods from Matcher class to traverse string and get match.

So use

...
if (matcher.find())
    System.out.println(matcher.group(1));

or if you want to make sure that entire string is matched by regex

...
if (matcher.matches())
    System.out.println(matcher.group(1));

answered Jun 18, 2014 at 15:23

Pshemo

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