def get_expressions():
    """Retrieve compiled pattern expressions.

    :returns: compiled regular expressions for supported filename formats
    :rtype: list
    """

    if len(_EXPRESSIONS) == len(FILENAME_PATTERNS):
        return _EXPRESSIONS

    for cpattern in FILENAME_PATTERNS:
        _EXPRESSIONS.append(re.compile(cpattern, re.VERBOSE))
    return _EXPRESSIONS
def get_expressions ( ) : if len ( _EXPRESSIONS ) == len ( FILENAME_PATTERNS ) : return _EXPRESSIONS for cpattern in FILENAME_PATTERNS : _EXPRESSIONS . append ( re . compile ( cpattern , re . VERBOSE ) ) return _EXPRESSIONS
Retrieve compiled pattern expressions.

    :returns: compiled regular expressions for supported filename formats
    :rtype: list