How to write the regex to get first word from my sample data's format in a single multiline event?

[d29priyanka]

AAA,NodeName,esbqpas01
AAA,timestampsize,0
AAA,note0, Warning - use the UNIX sort command to order this file before loading into a spreadsheet
AAA,note1, The First Column is simply to get the output sorted in the right order
AAA,note2, The T0001-T9999 column is a snapshot number. To work out the actual time; see the ZZZ section at the end
CPU_ALL,CPU Total esbqpas01,User%,Sys%,Wait%,Idle%,Busy,PhysicalCPUs 
PCPU_ALL,PCPU Total esbqpas01,User  ,Sys  ,Wait  ,Idle  , Entitled Capacity 
SCPU_ALL,SCPU Total esbqpas01,User  ,Sys  ,Wait  ,Idle   
CPU01,CPU 1 esbqpas01,User%,Sys%,Wait%,Idle% 
PCPU01,PCPU 1 esbqpas01,User ,Sys ,Wait ,Idle 
SCPU01,SCPU 1 esbqpas01,User ,Sys ,Wait ,Idle 
MEM,Memory esbqpas01,Real Free %,Virtual free %,Real free(MB),Virtual free(MB),Real total(MB),Virtual total(MB)
MEMNEW,Memory New esbqpas01,Process%,FScache%,System%,Free%,Pinned%,User%
MEMUSE,Memory Use esbqpas01,%numperm,%minperm,%maxperm,minfree,maxfree,%numclient,%maxclient, lruable pages
PAGE,Paging esbqpas01,faults,pgin,pgout,pgsin,pgsout,reclaims,scans,cycles
PROC,Processes esbqpas01,Runnable,Swap-in,pswitch,syscall,read,write,fork,exec,sem,msg,asleep_bufio,asleep_rawio,asleep_diocio
FILE,File I/O esbqpas01,iget,namei,dirblk,readch,writech,ttyrawch,ttycanch,ttyoutch
BBBN,000,NetworkName,MTU,Mbits,Name
NET,Network I/O esbqpas01,en0-read-KB/s,lo0-read-KB/s,en0-write-KB/s,lo0-write-KB/s
NETPACKET,Network Packets esbqpas01,en0-reads/s,lo0-reads/s,en0-writes/s,lo0-writes/s
NETSIZE,Network Size esbqpas01,en0-readsize,lo0-readsize,en0-writesize,lo0-writesize
NETERROR,Network Errors esbqpas01,en0-ierrs,lo0-ierrs,en0-oerrs,lo0-oerrs,en0-collisions,lo0-collisions

Need output into a type field with an output which looks like:
AAA
CPU_ALL
PCPU_ALL
....

[rsennett_splunk]

This is what you want: https://splunkbase.splunk.com/app/1753/
The NMON Performance Monitor for Unix and Linux Systems will do all that for you, and more.
Without a header (in which case you could use multikv) you are really going to have difficulty getting proper context from the data the way you have it...

[d29priyanka]

Actually its from that app which I need from.
I need the first strings into a field named type.
Also looking for regex without using multikv so that i could create that field.