Home Numbers Positive Integer Regular Expression Positive Integer Regular Expression A regular expression to match a positive integer value like 10, 20, 100, etc. /^\d+$/ Click To Copy Matches: 0 100 2000 Non-matches: 123.45 -100 abcd See Also: Regular Expression To Check If Number Is Float Negative Number Regular Expression Previous Post Regular Expression For Formatted Number With Space As Thousand Separator Next Post Positive Decimal Regular Expression More Like This: Regex To Match Whitespaces Between Words Regex To Match Chinese/Japanese/Korean Characters Regex To Match Content Between HTML Tags