Extract Integer Part in String

java string parsing integer java.util.scanner
Verhogen picture Verhogen · Dec 14, 2009 · Viewed 94.5k times · Source

What is the best way to extract the integer part of a string like

Hello123

How do you get the 123 part. You can sort of hack it using Java's Scanner, is there a better way?

Answer

Ascalonian picture Ascalonian · Dec 14, 2009

As explained before, try using Regular Expressions. This should help out:

String value = "Hello123";
String intValue = value.replaceAll("[^0-9]", ""); // returns 123

And then you just convert that to an int (or Integer) from there.

Related questions

How to convert/parse from String to char in java?

How do I parse a String value to a char type, in Java? I know how to do it to int and double (for example Integer.parseInt("123")). Is there a class for Strings and Chars?

Read More
In Java, how do I parse XML as a String instead of a file?

I have the following code: DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmlFile); How can I get it to parse XML contained within a String instead of a file?

Read More
How can I parse a String to BigDecimal?

I have this String: 10,692,467,440,017.120 (it's an amount). I want to parse it to a BigDecimal. The problem is that I have tried both DecimalFormat and NumbeFormat in vain.

Read More