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import re import codecs ESCAPE_SEQUENCE_RE = re.compile(r''' ( \\U........ # 8-digit hex escapes | \\u.... # 4-digit hex escapes | \\x.. # 2-digit hex escapes | \\[0-7]{1,3} # Octal escapes | \\N\{[^}]+\} # Unicode characters by name | \\[\\'"abfnrtv] # Single-character escapes )''', re.UNICODE | re.VERBOSE) def decode_escapes(s): def decode_match(match): return codecs.decode(match.group(0), 'unicode-escape') return ESCAPE_SEQUENCE_RE.sub(decode_match, s) 

import re import codecs ESCAPE_SEQUENCE_RE = re.compile(r''' ( \\U........ # 8-digit hex escapes | \\u.... # 4-digit hex escapes | \\x.. # 2-digit hex escapes | \\[0-7]{1,3} # Octal escapes | \\N\{[^}]+\} # Unicode characters by name | \\[\\'"abfnrtv] # Single-character escapes )''', re.UNICODE | re.VERBOSE) def decode_escapes(s): def decode_match(match): try: return codecs.decode(match.group(0), 'unicode-escape') except UnicodeDecodeError: # In case we matched the wrong thing after a double-backslash return match.group(0) return ESCAPE_SEQUENCE_RE.sub(decode_match, s) 

(Surprisingly, we do now have two problems.)

(Surprisingly, we do not now have two problems.)

import re import codecs ESCAPE_SEQUENCE_RE = re.compile(r''' ( \\U........ # 8-digit hex escapes | \\u.... # 4-digit hex escapes | \\x.. # 2-digit hex escapes | \\[0-7]{1,3} # Octal escapes | \\N\{[^}]+\} # Unicode characters by name | \\[\\'"abfnrtv] # Single-character escapes )''', re.UNICODE | re.VERBOSE) def decode_escapes(s): def decode_match(match): try: return codecs.decode(match.group(0), 'unicode-escape') except UnicodeDecodeError: return match.group(0) return ESCAPE_SEQUENCE_RE.sub(decode_match, s) 

import re import codecs ESCAPE_SEQUENCE_RE = re.compile(r''' ( \\U........ # 8-digit hex escapes | \\u.... # 4-digit hex escapes | \\x.. # 2-digit hex escapes | \\[0-7]{1,3} # Octal escapes | \\N\{[^}]+\} # Unicode characters by name | \\[\\'"abfnrtv] # Single-character escapes )''', re.UNICODE | re.VERBOSE) def decode_escapes(s): def decode_match(match): return codecs.decode(match.group(0), 'unicode-escape') return ESCAPE_SEQUENCE_RE.sub(decode_match, s)