Question

I have a simple EditText where a user can insert three values separated by commas. For instance, I can have the following template:

value1, value2, value3

where value1, value2 are of double type and value3 is integer.

How can I validate that the user has entered a text according to this template?

Answer 1

Use a regex Matcher.

final String DOUBLE = "\\d+(?:\\.\\d+)?";
final Pattern PATTERN = Pattern.compile(DOUBLE + ", " + DOUBLE + ", \\d+");
Matcher matcher = PATTERN.matcher(textView.getText().toString());
if (!matcher.matches()) {
    // invalid input
}