How to select part of a string?

[rychaney]

Hi,

I have the following string from a cli command output:

630860 packets input, 624821204 bytes, 0 no buffer

I want to select the number of bytes which is of a variable length. Is there a way to do this with the action string commands? I couldn't get this to work for me.

Kind regards,

Ryan

[Joe Clarke · Accepted solution]

Use regexp:

regexp "([0-9]+) bytes" $string match bytes

puts "Bytes is $bytes"

[rychaney]

Ok this works.

What do the ( ) brackets indicate? I had tried a similar string in the past but I didn't have these brackets.

Ryan

[Joe Clarke]

They indicate that you want to extract a sub-match, in this case the number of bytes.