PCRE Regex not working in Splunk

Required API call, RegEx i tried in https://regex101.com/ and the Regex which works in Splunk are given below. /Contact/v1/15965755/Order \/Contact\/v1\/[0-9]{1,}/Order /Contact/v1/*/Order Why PCRE regex not working in Splunk? If i add $ at the end to limit the search, that also not working. Somebody please throw some light on this. Thanks...