extracting utterances from specified tier ID

['Mingyu Yuan' via chibolts]

Hi everyone, 

I have a question about extracting participants' utterances using CLAN 
commands and was wondering if I'm thinking along the right lines. I'd 
appreciate it if you could take a look. Thanks!

I'm working with DementiaBank, specifically the ADReSS dataset, a subset of 
the Pitt corpus. I used the following command to extract the 'flow' tier of 
participants' utterances: `flo +cr +tPAR*`. Here, I have the asterisk * 
placed after the PAR identifier. But I noticed that in the CLAN manual, the 
asterisk typically precedes it, as in `t*PAR`. 

I got the following output after running `t*PAR`

flo (13-Apr-2023) is conducting analyses on:
  ONLY speaker main tiers matching: *PAR;

And here's the output after running `tPAR*`

flo (13-Apr-2023) is conducting analyses on:
  ONLY speaker main tiers matching: *PAR*;

It looks like the asterisk is used to search for tier ID patterns. Since 
all my files contain only INV and PAR tiers, I assume tier matching would 
only affect the selection of the PAR tier. I also used a Python function to 
verify that the utterances extracted by these two commands were identical 
(attached below, in case it's helpful). 

Both commands appear to work, but I don't fully understand why. Please let 
me know your thoughts. Thank you very much!

Best,
Mingyu

def check_clan_command(id, file_old, file_new):
    # Read the .cex file created by the old command (i.e. with tPAR*)
    with open(PATH_TO_OLD_FILE, 'r') as file_old_cmd:
        file_o = file_old_cmd.read().splitlines()
    # Read the .cex file created by the new command (i.e. with t*PAR)
    with open(PATH_TO_NEW_FILE, 'r') as file_new_cmd:
        file_n = file_new_cmd.read().splitlines()
    print(id, file_o == file_n)

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