Simple Log Service:How do I optimize regular expressions?

We recommend that you refer to the following rules when you optimize regular expressions:

• Use precise characters

  Do not use * to match fields. This expression leaves space for searching, and mismatch errors may occur. For example, if you want to extract a field that consists of only letters, use [A-Za-z].

• Use appropriate quantifiers

  Do not use + or *. For example, if you want to use \d to match IP addresses, use \d{1,3}, which is more efficient.

• Debug a regular expression multiple times

  Debugging is similar to troubleshooting. You can debug your regular expression at the regex101 website to reduce the time required for matching. If a large number of backtraces are found, you can optimize your regular expression at the earliest opportunity.