1 import re

     2 

     3 # Regular expression for recognizing HEXEWKB and WKT.  A prophylactic measure

     4 # to prevent potentially malicious input from reaching the underlying C

     5 # library.  Not a substitute for good web security programming practices.

     6 hex_regex = re.compile(r'^[0-9A-F]+$', re.I)

     7 wkt_regex = re.compile(r'^(SRID=(?P<srid>\d+);)?'

     8                        r'(?P<wkt>'

     9                        r'(?P<type>POINT|LINESTRING|LINEARRING|POLYGON|MULTIPOINT|MULTILINESTRING|MULTIPOLYGON|GEOMETRYCOLLECTION)'

    10                        r'[ACEGIMLONPSRUTYZ\d,\.\-\(\) ]+)$',

    11                        re.I)

    12 json_regex = re.compile(r'^(\s+)?\{[\s\w,\[\]\{\}\-\."\':]+\}(\s+)?$')