Is there any online regex tool to create regular expressions for given sample data ?
If you like Regex101 (and I do), but cannot reach it from a customer site or are concerned about sending private data to the internet you can run it offline using a trick from https://github.com/Syskaw/Regex101.com-offline-app/blob/master/runLocalRegex101.sh
As a regular expression generator (log entry as input, regex as output) you can also use the one under:
It provides a generic regex with URLs, IPs, ports, usernames and so on parsed at some extent.
The other sites were great for testing, but this one builds a RegEx from your Index data. Very helpful, thanks!