python - pexpect - how to match a lot of blocks in large output strings -

i using pexpect login remote devices query metrics.

the output of command large (about 15k bytes) , need extract many metrics output. use big pattern string

"key1:([0-9a-za-z]*).*key2:([0-9a-za-z]*).*key3......"

to match metrics. when pattern long, expect block , never terminate.

i've set maxread 20k doesn't work. have ideas on how resolve issue?

add code snippet:

        session.sendline(command_info["text"])         ret = session.expect([cmd_prompt, pexpect.eof, pexpect.timeout])         if ret == 1:             logger.error("eof error.")             return         if ret == 2:             logger.error("timeout")             return          result = re.match(getexpectedgroupstr(command_info, logger), session.before, re.s) 

if use big pattern string instead of cmd_prompt, session.expect hang , never terminate if timeout reached.