Pattern matching in validation

Question

As Given below I have to write one method in java before calculation performing. I am going to check if that string contains only numbers, but if I am going to enter floating points values it will not going to validate it.

Please suggest me right source code for it.

if (Purchase_Paid.getText().matches("[0-9]+")) {
    Global_Total = Float.parseFloat(Purchase_Amount.getText());
    Globle_paidAmount = Float.parseFloat(Purchase_Paid.getText());
    GlobleOutStandingAmount = (Global_Total - Globle_paidAmount);
    Purchase_Outstanding.setText(String.valueOf(GlobleOutStandingAmount));
} else {
    Alert alert = new Alert(Alert.AlertType.WARNING);
    alert.setTitle("Validation");
    alert.setHeaderText(null);
    alert.setContentText("Please enter only numbers in Paid fields");
    alert.showAndWait();

}

Possible duplicate of [Decimal or numeric values in regular expression validation](https://stackoverflow.com/questions/2811031/decimal-or-numeric-values-in-regular-expression-validation) — craigcaulfield, May 14 '18 at 06:18

score 0 · Answer 1 · answered May 14 '18 at 06:02

0

you check if string is numeric like this

if (Purchase_Paid.getText().matches("^[-+]?\\d+(\\.\\d+)?$")){

}

answered May 14 '18 at 06:02

hakim

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score 0 · Answer 2 · answered May 14 '18 at 06:14

Regular expression [0-9]+ will only match for numbers in your text. If you want to allow floating point numbers too, then use following regex

[+-]?([0-9]*[.])?[0-9]+

if (Purchase_Paid.getText().matches("[+-]?([0-9]*[.])?[0-9]+")) {
    //Take Necessary action
}

Pattern matching in validation

2 Answers2