Source code for lector.types.regex

"""Common regex patterns used in mutiple modules."""



RE_INT_SIGN = "^(?P<sign>[+-])?(?P<num>[0-9]+)$"

"""Capture optional sign and numeric parts in integer strings."""



RE_IS_INT = r"^\+?\-?[0-9]+$"

"""Strings matching int representations we're able to parse."""



RE_IS_FLOAT = "^[-]?[0-9]*[.]?[0-9]*(?:[e][+-]?[0-9]+)?$"

"""Strings matching float representations convertable by Arrow. Allows ints too,
but those should have been inferred before trying floats.
"""



RE_LIST_LIKE: str = r"^[\(\[\|][\s\S]*[\)\]\|]$"

"""Lists start and end with parenthesis-like characters."""



RE_LIST_CLEAN: str = r"^[\[\{\(\|<]|[\]\}\)\|>]$|\r?\n"

"""Remove all parenthesis-like characters from start and end as well as line breaks."""




RE_URL = (
    r"^(http://www\.|https://www\.|http://|https://)?"  # http:// or https://
    r"(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?|"  # domain...
    r"localhost|"  # localhost...
    r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"  # ...or ip
    r"(?::\d+)?"  # optional port
    r"(?:/?|[/?]\S+)$"
)




RE_TRAILING_DECIMALS: str = r"\.(\d+)$"

"""Strictly trailing, i.e. nothing after the decimals."""



RE_FRATIONAL_SECONDS: str = r"(?P<frac>\.\d+)"

"""Allows for timezone after fractional seconds, capturing part to be replaced."""



RE_TZ_OFFSET: str = r"(?P<tz>Z|[+-]\d{2}:?\d{2}$)"

"""Detect 4 digit timezone offsets, with or without colon."""