Plot the geometry of a shapefile whose fields match a regular expression given

    :param sf: shapefile
    :type sf: shapefile object
    :regex: regular expression to match
    :type regex: string
    :field: field number to be matched with the regex
    :type field: integer

def plot_string_match(sf,regex,field,**kwargs):
    """
    Plot the geometry of a shapefile whose fields match a regular expression given

    :param sf: shapefile
    :type sf: shapefile object
    :regex: regular expression to match
    :type regex: string
    :field: field number to be matched with the regex
    :type field: integer
    """
    index,shape_records = string_match(sf,regex,field)
    plot(shape_records,**kwargs)