Add check_escape.py quality checker for issue #149.

[dliu04]

Implements check_escape.py script to detect "Wrong escape" issues as specified in GitHub issue #149. The script identifies:

• Incomplete LaTeX commands (\c, \p, \l)
• Invalid escape characters (-)
• Improper quote escaping
• Unknown escape sequences

[koppor]

Pleae wire into https://github.com/JabRef/abbrv.jabref.org/blob/main/.github/workflows/checks.yml

[koppor]

Review hint: Does this PR update existing fetched lists? If yes: Discuss alternatives (no failing PR, just report -> workflow summary; plus report to upstream list provider)

[subhramit]

Suggested change

	for file in fileNames:
	if (file.endswith(".csv")):
	# For each .csv file in the folder, open in read mode
	with open(PATH_TO_JOURNALS + file, "r", encoding='utf-8', errors='ignore') as f:
	for i, line in enumerate(f):
	# Look for specific problematic patterns
	problematic_patterns = [
	(r'\\c(?![primeyrd])', 'incomplete LaTeX command - should be \\cyr or \\cprime'),
	(r'\\p(?!olhk)', 'incomplete LaTeX command - should be \\polhk'),
	(r'\\l(?!dots|asp)', 'incomplete LaTeX command'),
	(r'\\"[^,"]', 'improper quote escaping'),
	(r'\\(?![\\"/nrt$&-]|sp|rm|circledR|cprime|cyr|polhk|cdprime|ldots|lasp)[a-zA-Z]+', 'unknown escape sequence'),
	]
	for pattern, description in problematic_patterns:
	matches = re.finditer(pattern, line)
	for match in matches:
	# Skip if we're inside a mathematical expression (between $ signs)
	line_before_match = line[:match.start()]
	line_after_match = line[match.end():]
	dollar_count_before = line_before_match.count('$')
	dollar_count_after = line_after_match.count('$')
	# If we have an odd number of $ before and after, we're inside math - allow it
	if (dollar_count_before % 2 == 1) and (dollar_count_after % 2 == 1):
	continue
	errFileNames.append(file)
	for fileName in fileNames:
	if (fileName.endswith(".csv")):
	# For each .csv file in the folder, open in read mode
	with open(PATH_TO_JOURNALS + fileName, "r", encoding='utf-8', errors='ignore') as f:
	for i, line in enumerate(f):
	# Look for specific problematic patterns
	problematic_patterns = [
	(r'\\c(?![primeyrd])', 'incomplete LaTeX command - should be \\cyr or \\cprime'),
	(r'\\p(?!olhk)', 'incomplete LaTeX command - should be \\polhk'),
	(r'\\l(?!dots|asp)', 'incomplete LaTeX command'),
	(r'\\"[^,"]', 'improper quote escaping'),
	(r'\\(?![\\"/nrt$&-]|sp|rm|circledR|cprime|cyr|polhk|cdprime|ldots|lasp)[a-zA-Z]+', 'unknown escape sequence'),
	]
	for pattern, description in problematic_patterns:
	matches = re.finditer(pattern, line)
	for match in matches:
	# Skip if we're inside a mathematical expression (between $ signs)
	line_before_match = line[:match.start()]
	line_after_match = line[match.end():]
	dollar_count_before = line_before_match.count('$')
	dollar_count_after = line_after_match.count('$')
	# If we have an odd number of $ before and after, we're inside math - allow it
	if (dollar_count_before % 2 == 1) and (dollar_count_after % 2 == 1):
	continue
	errFileNames.append(fileName)