Java searching float number in String

Question

let\'s say i have string like that:

eXamPLestring>1.67>>ReSTOfString

my task is to extract only 1.67 from string above.

Answer 1

/**
 * Extracts the first number out of a text.
 * Works for 1.000,1 and also for 1,000.1 returning 1000.1 (1000 plus 1 decimal).
 * When only a , or a . is used it is assumed as the float separator.
 *
 * @param sample The sample text.
 *
 * @return A float representation of the number.
 */
static public Float extractFloat(String sample) {
    Pattern pattern = Pattern.compile("[\\d.,]+");
    Matcher matcher = pattern.matcher(sample);
    if (!matcher.find()) {
        return null;
    }

    String floatStr = matcher.group();

    if (floatStr.matches("\\d+,+\\d+")) {
        floatStr = floatStr.replaceAll(",+", ".");

    } else if (floatStr.matches("\\d+\\.+\\d+")) {
        floatStr = floatStr.replaceAll("\\.\\.+", ".");

    } else if (floatStr.matches("(\\d+\\.+)+\\d+(,+\\d+)?")) {
        floatStr = floatStr.replaceAll("\\.+", "").replaceAll(",+", ".");

    } else if (floatStr.matches("(\\d+,+)+\\d+(.+\\d+)?")) {
        floatStr = floatStr.replaceAll(",", "").replaceAll("\\.\\.+", ".");
    }

    try {
        return new Float(floatStr);
    } catch (NumberFormatException ex) {
        throw new AssertionError("Unexpected non float text: " + floatStr);
    }
}