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Hello. In this video we are going to speak about how to validate comma-separated values. First, we need to know what kind of pattern we use to match one of the values. In this case, letamp;#39;s try integer numbers. We know that in order to match an entire string, we need to use anchors. Now letamp;#39;s start. The caret symbol will match the start of string, then we match one or more digits, and then we match zero or more occurrences of a comma and one or more digits. And then we match the end of string using the dollar symbol. So this is the pattern that validates strings that only contain comma-separated integer numbers. Look, weamp;#39;ve got all the matches here and we do not match any of these strings. If there can be whitespaces in between the commas, for example, here, here, here, we can add amp;quot;\s*amp;quot; pattern around the comma. This will ensure that even if we have whitespaces on either side of the comma, the string will get validated. Instead of the comma, you
