Python isnt printing my regex expression results (or anything)?

Question

I'm trying to extract the first number that appears in the first line of my text file. I'm a noob, so I'm playing around with regex. The issue I have is nothing is printing, so i'm not sure if it's my code or something else?

I've tried printing my file names too and nothing happens either so i'm not sure whats going on

work_dir = "User/...my folder of 9 text files"
for path in glob.glob(os.path.join(work_dir, "*.txt")):
    with io.open(path, mode="r", encoding="utf-8") as file:
        first_line = file.readline()
        for line[34:] in first_line:
            if "LOCUS" in line[0:34]:
                matches = int(re.search(r"(\d+)", first_line).group(0))
                print(matches)

    name = os.path.basename(path).replace(".gbff", "")
    print(name)

Here's the head of an example of the types of files im working with. It's a text file even though it looks like a table here.

LOCUS       AE017334             *5227419* bp    DNA     circular BCT 03-DEC-2015
DEFINITION  Bacillus anthracis str. 'Ames Ancestor', complete genome.
ACCESSION   AE017334
VERSION     AE017334.2
DBLINK      BioProject: PRJNA10784
            BioSample: SAMN02603433

I need the number I've put ** around

Answer 1

str = open('a.txt', 'r').read()
import re
start = '*'
end = '*'

print( (str[str.find(start)+len(start):str.rfind(end)]))
print("\n")

I saved your file as a.txt replace with your file name & if you need only locus values. Re arrange text before using regx

Answer 2

I actually got output for your regex and text format, and its working fine with slicing and other stuff u mentioned, so its not the regex or the for loop part, since u are saying its not printing anything and i am assuming its not printing out errors too i think it has something to do with your path or directory readings.

anyways here's your regex part: f

first_line='LOCUS       AE017334             *5227419* bp    DNA     circular BCT 03-DEC-2015'
matches = int(re.search(r"(\d+)", first_line[34:]).group(0))
print(matches)

output:

5227419

posting this so others trying to answer can skip these steps and check into the other parts of your code