environment/lib/python2.7/site-packages/IPython/external/pexpect/_pexpect.py
def search(self, buffer, freshlen, searchwindowsize=None):

        """This searches 'buffer' for the first occurence of one of the regular
        expressions. 'freshlen' must indicate the number of bytes at the end of
        'buffer' which have not been searched before.

        See class spawn for the 'searchwindowsize' argument.

        If there is a match this returns the index of that string, and sets
        'start', 'end' and 'match'. Otherwise, returns -1."""

        absurd_match = len(buffer)
        first_match = absurd_match
        # 'freshlen' doesn't help here -- we cannot predict the
        # length of a match, and the re module provides no help.
        if searchwindowsize is None:
            searchstart = 0
        else:
            searchstart = max(0, len(buffer)-searchwindowsize)
        for index, s in self._searches:
            match = s.search(buffer, searchstart)
            if match is None:
                continue
            n = match.start()
            if n < first_match:
                first_match = n
                the_match = match
                best_index = index
        if first_match == absurd_match:
            return -1
        self.start = first_match
        self.match = the_match
        self.end = self.match.end()
        return best_index
def search(self, buffer, freshlen, searchwindowsize=None):

        """This searches 'buffer' for the first occurence of one of the regular
        expressions. 'freshlen' must indicate the number of bytes at the end of
        'buffer' which have not been searched before.

        See class spawn for the 'searchwindowsize' argument.

        If there is a match this returns the index of that string, and sets
        'start', 'end' and 'match'. Otherwise, returns -1."""

        absurd_match = len(buffer)
        first_match = absurd_match
        # 'freshlen' doesn't help here -- we cannot predict the
        # length of a match, and the re module provides no help.
        if searchwindowsize is None:
            searchstart = 0
        else:
            searchstart = max(0, len(buffer)-searchwindowsize)
        for index, s in self._searches:
            match = s.search(buffer, searchstart)
            if match is None:
                continue
            n = match.start()
            if n < first_match:
                first_match = n
                the_match = match
                best_index = index
        if first_match == absurd_match:
            return -1
        self.start = first_match
        self.match = the_match
        self.end = self.match.end()
        return best_index
This searches 'buffer' for the first occurence of one of the regular
        expressions. 'freshlen' must indicate the number of bytes at the end of
        'buffer' which have not been searched before.

        See class spawn for the 'searchwindowsize' argument.

        If there is a match this returns the index of that string, and sets
        'start', 'end' and 'match'. Otherwise, returns -1.