A tiny python script which parses an input file in the same folder for strings between "" or '' and searches for a prefix. Example usage: python parse.py "html.html" "attr_"

parse.py

import sys
import re
import os

inputfile = sys.argv[1]
prefix = sys.argv[2]
print("Extract:"+prefix);

def lreplace(pattern, sub, string):
    """
    Replaces 'pattern' in 'string' with 'sub' if 'pattern' starts 'string'.
    """
    return re.sub('^%s' % pattern, sub, string)

def parseLine(line):
	output = ""
	parts = line.split('\"')+line.split("\'")
	return [part for part in parts if part.startswith(prefix)]

files = [f for f in os.listdir('.') if os.path.isfile(f)]

for f in files:
	if f.startswith(inputfile):
		infile = f
		outfile = "output.txt"
		
		try:
			with open(infile, encoding='utf8') as input, open(outfile,"w", encoding='utf8') as outf:
				lines = [parseLine(line) for line in list(input) if prefix in line]
				d = {}
				for line in lines:
					for attr in line:
						d[value] = attr+"\n"
				for key, value in sorted(d.items()): # Note the () after items!
					outf.write(key);
		except UnicodeDecodeError:
			with open(infile) as input, open(outfile,"w", encoding='utf8') as outf:
				lines = [parseLine(line) for line in list(input) if prefix in line]
				d = {}
				for line in lines:
					for attr in line:
						d[attr] = attr+"\n"
				for key, value in sorted(d.items()): # Note the () after items!
					outf.write(value);
print("Done.")