Character matching
Your sales data sometimes contains typos or formatting errors that could break your analysis. Before calculating total revenue, you need to verify that all sales quantities contain only valid numeric characters and decimal points. You've extracted some sales quantities (in millions of units) from the video game dataset.
This exercise is part of the course
Cleaning Data in Java
Exercise instructions
- Check if
quantitycontains any digits (0 to 9). - Look for the decimal separator in
quantity. - Detect any alphabetic characters in
quantity(lowercase or uppercase).
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
import java.util.Arrays;
import java.util.List;
import com.google.common.base.CharMatcher;
public class PatternValidation {
public static void main(String[] args) {
List quantities = Arrays.asList("41.49", "29.08", "15.85", "12.5x");
for (String quantity : quantities) {
// Check if quantity contains any digits
boolean hasDigits = ____.____('0', '9').matchesAnyOf(quantity);
// Look for decimal separator in quantity
boolean hasDecimal = CharMatcher.is('.').____(quantity);
// Detect any alphabetic characters in quantity
boolean hasInvalidChars = CharMatcher.inRange('____', '____')
.or(CharMatcher.inRange('____', '____')).matchesAnyOf(quantity);
boolean isValid = hasDigits && hasDecimal && !hasInvalidChars;
System.out.println(quantity + " has valid characters: " + isValid);
}
}
}