Removing Text and Leaving just numbers

hey guys

i have a sheet dealing with part numbers and a paramiter exported from a programme.

L=1000MM | L/R is an example.

now
i use replace to get rid of everything before the number but anything after the mm is totaly different most of the time.
is there a way that i can get rind of anything after, and including, the mm?
or by some chance a command that will just leave me with the number allone??

Ps: sorry about the title before was totaly incorrect