Python split string without splitting escaped character

Question

Is there a way to split a string without splitting escaped character? For example, I have a string and want to split by \':\' and not by \'\\:\'

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Answer 1

I really know this is an old question, but i needed recently an function like this and not found any that was compliant with my requirements.

Rules:

• Escape char only works when used with escape char or delimiter. Ex. if delimiter is / and escape are \ then (\a\b\c/abc bacame ['\a\b\c', 'abc']
• Multiple escapes chars will be escaped. (\\ became \)

So, for the record and if someone look anything like, here my function proposal:

def str_escape_split(str_to_escape, delimiter=',', escape='\\'):
    """Splits an string using delimiter and escape chars

    Args:
        str_to_escape ([type]): The text to be splitted
        delimiter (str, optional): Delimiter used. Defaults to ','.
        escape (str, optional): The escape char. Defaults to '\'.

    Yields:
        [type]: a list of string to be escaped
    """
    if len(delimiter) > 1 or len(escape) > 1:
        raise ValueError("Either delimiter or escape must be an one char value")
    token = ''
    escaped = False
    for c in str_to_escape:
        if c == escape:
            if escaped:
                token += escape
                escaped = False
            else:
                escaped = True
            continue
        if c == delimiter:
            if not escaped:
                yield token
                token = ''
            else:
                token += c
                escaped = False
        else:
            if escaped:
                token += escape
                escaped = False
            token += c
    yield token

For the sake of sanity, i'm make some tests:

# The structure is:
# 'string_be_split_escaped', [list_with_result_expected]
tests_slash_escape = [
    ('r/casa\\/teste/g', ['r', 'casa/teste', 'g']),
    ('r/\\/teste/g', ['r', '/teste', 'g']),
    ('r/(([0-9])\\s+-\\s+([0-9]))/\\g<2>\\g<3>/g',
     ['r', '(([0-9])\\s+-\\s+([0-9]))', '\\g<2>\\g<3>', 'g']),
    ('r/\\s+/ /g', ['r', '\\s+', ' ', 'g']),
    ('r/\\.$//g', ['r', '\\.$', '', 'g']),
    ('u///g', ['u', '', '', 'g']),
    ('s/(/[/g', ['s', '(', '[', 'g']),
    ('s/)/]/g', ['s', ')', ']', 'g']),
    ('r/(\\.)\\1+/\\1/g', ['r', '(\\.)\\1+', '\\1', 'g']),
    ('r/(?<=\\d) +(?=\\d)/./', ['r', '(?<=\\d) +(?=\\d)', '.', '']),
    ('r/\\\\/\\\\\\/teste/g', ['r', '\\', '\\/teste', 'g'])
]

tests_bar_escape = [
    ('r/||/|||/teste/g', ['r', '|', '|/teste', 'g'])
]

def test(test_array, escape):
    """From input data, test escape functions

    Args:
        test_array ([type]): [description]
        escape ([type]): [description]
    """
    for t in test_array:
        resg = str_escape_split(t[0], '/', escape)
        res = list(resg)
        if res == t[1]:
            print(f"Test {t[0]}: {res} - Pass!")
        else:
            print(f"Test {t[0]}: {t[1]} != {res} - Failed! ")


def test_all():
    test(tests_slash_escape, '\\')
    test(tests_bar_escape, '|')


if __name__ == "__main__":
    test_all()