thanks but no cigar! I would like the output to be 
cache,23778,0.0,0,0.0,0,0.0,0.0,0.00
cache,205,0.0,0,0.0,0,0.0,0.0,0.00
"newline here"
DISK-UTIL-PEAK-HIGH:,54.3,DISK-UTIL:,2.5
"newline here"
PROC-Name,PID,PYS-IO-RATE,READs,READ-RATE,WRITEs
cache,26094,0.9,1,0.9,0,0.0,0.0,0.00
cache,16046,0.0,0,0.0,0,0.0,0.0,0.00
cache,3848,0.0,0,0.0,0,0.0,0.0,0.00
cache,23778,0.0,0,0.0,0,0.0,0.0,0.00
cache,205,0.0,0,0.0,0,0.0,0.0,0.00
"newline here"
DISK-UTIL-PEAK-HIGH:,54.3,DISK-UTIL:,3  ### last line ###

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In reply to Re^2: regexp look behind? by dbs
in thread regexp look behind? by dbs

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