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import _re2
import sre_constants

__all__ = [
    "error",
    "escape",
    "compile",
    "search",
    "match",
    "fullmatch",
    "Set",
    "UNANCHORED",
    "ANCHOR_START",
    "ANCHOR_BOTH",
    ]

# Module-private compilation function, for future caching, other enhancements
_compile = _re2._compile

error = sre_constants.error
escape = _re2.escape
Set = _re2.Set
UNANCHORED = _re2.UNANCHORED
ANCHOR_START = _re2.ANCHOR_START
ANCHOR_BOTH = _re2.ANCHOR_BOTH


def compile(pattern):
    "Compile a regular expression pattern, returning a pattern object."
    return _compile(pattern, error)

def search(pattern, string):
    """Scan through string looking for a match to the pattern, returning
    a match object, or None if no match was found."""
    return _compile(pattern, error).search(string)

def match(pattern, string):
    """Try to apply the pattern at the start of the string, returning
    a match object, or None if no match was found."""
    return _compile(pattern, error).match(string)

def fullmatch(pattern, string):
    """Try to apply the pattern to the entire string, returning
    a match object, or None if no match was found."""
    return _compile(pattern, error).fullmatch(string)