diff options
Diffstat (limited to 'Lib/re.py')
| -rw-r--r-- | Lib/re.py | 26 |
1 files changed, 15 insertions, 11 deletions
@@ -223,12 +223,14 @@ def template(pattern, flags=0): return _compile(pattern, flags|T) _alphanum_str = frozenset( - "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890") + "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890") _alphanum_bytes = frozenset( - b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890") + b"_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890") def escape(pattern): - "Escape all non-alphanumeric characters in pattern." + """ + Escape all the characters in pattern except ASCII letters, numbers and '_'. + """ if isinstance(pattern, str): alphanum = _alphanum_str s = list(pattern) @@ -263,13 +265,14 @@ _cache_repl = {} _pattern_type = type(sre_compile.compile("", 0)) _MAXCACHE = 512 - def _compile(pattern, flags): # internal: compile pattern - try: - return _cache[type(pattern), pattern, flags] - except KeyError: - pass + bypass_cache = flags & DEBUG + if not bypass_cache: + try: + return _cache[type(pattern), pattern, flags] + except KeyError: + pass if isinstance(pattern, _pattern_type): if flags: raise ValueError( @@ -278,9 +281,10 @@ def _compile(pattern, flags): if not sre_compile.isstring(pattern): raise TypeError("first argument must be string or compiled pattern") p = sre_compile.compile(pattern, flags) - if len(_cache) >= _MAXCACHE: - _cache.clear() - _cache[type(pattern), pattern, flags] = p + if not bypass_cache: + if len(_cache) >= _MAXCACHE: + _cache.clear() + _cache[type(pattern), pattern, flags] = p return p def _compile_repl(repl, pattern): |