How to parse this particular console output and make csv?

I need to process console output which looks like this and make a csv from it:

ID,FLAG,ADDRESS,MAC-ADDRESS,HOST-NAME,SERVER,STATUS,LAST-SEEN
0   10.0.0.11     00:1D:72:29:F2:4F                lan      waiting  never
;;; test comment
1   10.0.0.19     00:13:21:15:D4:00                lan      waiting  never
2   10.0.0.10     00:60:6E:05:0C:E0                lan      waiting  never
3 D 10.0.1.199    24:E9:B3:20:FA:C7  home          server1  bound    4h54m52s
4 D 100.64.1.197  E6:17:AE:21:EA:00  Suzana-s-A51  dhcp1    bound    2h16m45s

I have managed to split lines but regex is not working for tabs and spaces. Can someone point me in the right direction?

The code I am using is this:

import csv
import re

# Open the input file in read-only mode
with open('output.txt', 'r') as input_file:
    # Open the output file in write-only mode
    with open('output.csv', 'w') as output_file:
        # Create a CSV writer that will write to the output file
        writer = csv.writer(output_file)

        # Read the first line of the input file (the header)
        # and write it to the output file as a single value
        # (i.e. do not split it on commas)
        header = input_file.readline()
        writer.writerow([header.strip()])

        # Iterate over the remaining lines of the input file
        for line in input_file:
            # Ignore lines that start with ";;;" (these are comments)
            if line.startswith(';;;'):
                continue

            # Split the line on newlines
            values = line.split('n')

            line = re.sub(r'[t ]+', ',', line)

            # Iterate over the resulting values
            for i, value in enumerate(values):
                # If the value contains a comma, split it on commas
                # and assign the resulting values to the `values` list
                if ',' in value:
                    values[i:i+1] = value.split(',')

            # Write the values to the output file
            writer.writerow(values)

Answer

The regular expression can be handy here, make a mask, and then take each value from line read. you can refer the regex and will give you great visuals.

so for each line will put a regex reg_format=r"(d*?)(?:s+)(.*?)(?:s)(?:s*?)(w*.w*.w*.w*)(?:s*)(w*?:w*?:w*?:w*?:w*?:w*)(?:s*)(w*)(?:s*)(w*)(?:s*)(w*)"

pls note that when we write to csv using writer.writerow it expects a list. following would work for you, and you can tweak it as needed.

tweaked your code, and added the comments
Update: Added masking for records

import csv
import re

#reg_format=r"(d*?)(?:s+)(.*?)(?:s)(?:s*?)(w*.w*.w*.w*)(?:s*)(w*?:w*?:w*?:w*?:w*?:w*)(?:s*)(w*)(?:s*)(w*)(?:s*)(w*)"
all_fields=r"(d*?)(?:s+)(.*?)(?:s)(?:s*?)(w*.w*.w*.w*)(?:s*)(w*?:w*?:w*?:w*?:w*?:w*)(?:s{1,2})([w-]{1,14})(?:s*?)(w+)(?:s*)(w+)(?:s*)(w*)(?:s*)(w*)"
all_fields_minus_host=r"(d*?)(?:s+)(.*?)(?:s)(?:s*?)(w*.w*.w*.w*)(?:s*)(w*?:w*?:w*?:w*?:w*?:w*)(?:s{1,})([w-]{1,14})(?:s*?)(w+)(?:s*)(w+)(?:s*)(w*)(?:s*)(w*)"
# Open the input file in read-only mode
with open('testreg.txt', 'r') as input_file:
    # Open the output file in write-only mode
    with open('output.csv', 'w') as output_file:
        # Create a CSV writer that will write to the output file
        writer = csv.writer(output_file)

        # Read the first line of the input file (the header)
        # and write it to the output file as a single value
        # (i.e. do not split it on commas)
        header = input_file.readline()
        writer.writerow(header.split(',')) # split by "," as write row need list
        #writer.writerow([header.strip()])

        # Iterate over the remaining lines of the input file
        for line in input_file:
            # Ignore lines that start with ";;;" (these are comments)
            if line.startswith(';;;'):
                continue
            #print(line)
            gps=re.findall(all_fields,line)
            if gps:
                line_write=(['"'+gp+'"' for gp in list(gps[0])]) # if dont need quotes, put like gp for gp in list(gps[0])]
                writer.writerow(line_write[:-1])
            else:
                gps=re.findall(all_fields_minus_host,line)
                line_write=(['"'+gp+'"' for gp in list(gps[0])]) # if dont need quotes, put like gp for gp in list(gps[0])]
                line_write.insert(4,'""')
                writer.writerow(line_write[:-2])
                
                
            #writer.writerow(line_write)
            # commented below line
            '''
            # Split the line on newlines
            values = line.split('n')

            line = re.sub(r'[t ]+', ',', line)

            # Iterate over the resulting values
            for i, value in enumerate(values):
                # If the value contains a comma, split it on commas
                # and assign the resulting values to the `values` list
                if ',' in value:
                    values[i:i+1] = value.split(',')

            # Write the values to the output file
            #writer.writerow(values)
            '''