KSH: how to find the position of a substring in a string

[klayme]

Hi all.
I need to get the substring PRUEBAS_RMAN_PARCHES from the following string
"BP Key: 47531 Status: AVAILABLE Tag: PRUEBAS_RMAN_PARCHES"
But the position and length may vary between different strings.
The string will always be preceded by the other string "Tag: ", so I'd like to use it as starting point
Anybody can please tell me the easy way to do it?
Thanks a lot.

[Irithori]

No idea, if it is possible with ksh alone, but sed can do it:

echo "BP Key: 47531 Status: AVAILABLE Tag: PRUEBAS_RMAN_PARCHES" | sed 's/\(.*\)Tag: \(.*\)/\2/'
PRUEBAS_RMAN_PARCHES

[klayme]

Yes, that's exactly what I was looking for.
Thanks

[Irithori]

Be aware though, that this simple regex will take anything after "Tag: " until the end of the line.
If there are other columns following, you probably need a more complex one that matches all the cases of your data.