Allow positive and decimal values and ignore other values in string field in ServiceNow

Client-Side Components/Client Scripts/Allow positive and decimal values/Allow positive and decimal values.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue == '') {
+        return;
+    }
+
+    var regex = /^[0-9]+(\.\d{1,2})?$/; // Allows positive integers or decimals
+
+    if (!regex.test(newValue) || newValue <= 0) {
+        g_form.setValue('amount', '');
+        g_form.showFieldMsg('amount', 'Please enter a amount greater than zero with decimals .Decimals are allowed here.', 'error');
+
+    }
+}

Client-Side Components/Client Scripts/Allow positive and decimal values/readme.md

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+Purpose of this script:
+
+It matches positive numbers (integers or decimals)
+It does not match 0 or 0.0 (i.e., it excludes non-positive numbers).
+
+So this regex is used when you want to allow only positive (> 0) integer or decimal values.
+It will give us the field message error if anyone tries to enter anything apart from the allowed values