Can less search multiple patterns?

That's a great question! While the standard search in less (using /) usually focuses on one pattern at a time, you can actually achieve multiple pattern searching using Regular Expressions.

Since less supports extended regular expressions, you can search for multiple terms simultaneously using the OR pipe operator (|).

How to do it:

1. Open your file: less server_log.txt
2. Press / to start a search.
3. Type your patterns separated by \| (the backslash escapes the pipe).

For example, to find lines containing either "ERROR" or "WARNING":

/ERROR\|WARNING

Tips for Multiple Searches:

• Case Insensitivity: If you want to search regardless of upper or lower case, type -i while inside less before you search, or start less with the -i flag: less -i server_log.txt.
• Highlighting: less will highlight all matches for both terms.
• Navigation: Just like a single search, press n to go to the next occurrence (of either word) and N to go to the previous one.

In your current lab setup, try opening the file and searching for two different events at once to see how it works!