stopping at text....

[nelg]

G'day guys, I know there is a simple answer to this. I am searching a column of values and want to stop when I hit a certain string of text. Problem is it will be in larger string.

example: in the below example I find the load case (say load1) but load1 is in a larger string.

this is load1
401
405
410
417
418
this is load2
404
407
413
415
418
419

thanks for your help.