re.py 文件源码

def _compile_repl(*key):
    # internal: compile replacement pattern
    p = _cache_repl.get(key)
    if p is not None:
        return p
    repl, pattern = key
    try:
        p = sre_parse.parse_template(repl, pattern)
    except error, v:
        raise error, v # invalid expression
    if len(_cache_repl) >= _MAXCACHE:
        _cache_repl.clear()
    _cache_repl[key] = p
    return p