#!/usr/bin/env python """ Regex for URIs These regex are directly derived from the collected ABNF in RFC3986 (except for DIGIT, ALPHA and HEXDIG, defined by RFC2234). They should be processed with re.VERBOSE. """ __license__ = """ Copyright (c) 2009 Mark Nottingham (code portions) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ ### basics DIGIT = r"[\x30-\x39]" ALPHA = r"[\x41-\x5A\x61-\x7A]" HEXDIG = r"[\x30-\x39ABCDEF]" # pct-encoded = "%" HEXDIG HEXDIG pct_encoded = r" %% %(HEXDIG)s %(HEXDIG)s" % locals() # unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" unreserved = r"(?: %(ALPHA)s | %(DIGIT)s | \- | \. | _ | ~ )" % locals() # gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" gen_delims = r"(?: : | / | \? | \# | \[ | \] | @ )" # sub-delims = "!" / "$" / "&" / "'" / "(" / ")" # / "*" / "+" / "," / ";" / "=" sub_delims = r"""(?: ! | \$ | & | ' | \( | \) | \* | \+ | , | ; | = )""" # pchar = unreserved / pct-encoded / sub-delims / ":" / "@" pchar = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : | @ )" % locals() # reserved = gen-delims / sub-delims reserved = r"(?: %(gen_delims)s | %(sub_delims)s )" % locals() ### scheme # scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) scheme = r"%(ALPHA)s (?: %(ALPHA)s | %(DIGIT)s | \+ | \- | \. )*" % locals() ### authority # dec-octet = DIGIT ; 0-9 # / %x31-39 DIGIT ; 10-99 # / "1" 2DIGIT ; 100-199 # / "2" %x30-34 DIGIT ; 200-249 # / "25" %x30-35 ; 250-255 dec_octet = r"""(?: %(DIGIT)s | [\x31-\x39] %(DIGIT)s | 1 %(DIGIT)s{2} | 2 [\x30-\x34] %(DIGIT)s | 25 [\x30-\x35] ) """ % locals() # IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet IPv4address = r"%(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s" % locals() # h16 = 1*4HEXDIG h16 = r"(?: %(HEXDIG)s ){1,4}" % locals() # ls32 = ( h16 ":" h16 ) / IPv4address ls32 = r"(?: (?: %(h16)s : %(h16)s ) | %(IPv4address)s )" % locals() # IPv6address = 6( h16 ":" ) ls32 # / "::" 5( h16 ":" ) ls32 # / [ h16 ] "::" 4( h16 ":" ) ls32 # / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32 # / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32 # / [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32 # / [ *4( h16 ":" ) h16 ] "::" ls32 # / [ *5( h16 ":" ) h16 ] "::" h16 # / [ *6( h16 ":" ) h16 ] "::" IPv6address = r"""(?: (?: %(h16)s : ){6} %(ls32)s | :: (?: %(h16)s : ){5} %(ls32)s | %(h16)s :: (?: %(h16)s : ){4} %(ls32)s | (?: %(h16)s : ) %(h16)s :: (?: %(h16)s : ){3} %(ls32)s | (?: %(h16)s : ){2} %(h16)s :: (?: %(h16)s : ){2} %(ls32)s | (?: %(h16)s : ){3} %(h16)s :: %(h16)s : %(ls32)s | (?: %(h16)s : ){4} %(h16)s :: %(ls32)s | (?: %(h16)s : ){5} %(h16)s :: %(h16)s | (?: %(h16)s : ){6} %(h16)s :: ) """ % locals() # IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" ) IPvFuture = r"v %(HEXDIG)s+ \. (?: %(unreserved)s | %(sub_delims)s | : )+" % locals() # IP-literal = "[" ( IPv6address / IPvFuture ) "]" IP_literal = r"\[ (?: %(IPv6address)s | %(IPvFuture)s ) \]" % locals() # reg-name = *( unreserved / pct-encoded / sub-delims ) reg_name = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s )*" % locals() # userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) userinfo = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : )" % locals() # host = IP-literal / IPv4address / reg-name host = r"(?: %(IP_literal)s | %(IPv4address)s | %(reg_name)s )" % locals() # port = *DIGIT port = r"(?: %(DIGIT)s )*" % locals() # authority = [ userinfo "@" ] host [ ":" port ] authority = r"(?: %(userinfo)s @)? %(host)s (?: : %(port)s)?" % locals() ### Path # segment = *pchar segment = r"%(pchar)s*" % locals() # segment-nz = 1*pchar segment_nz = r"%(pchar)s+" % locals() # segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" ) # ; non-zero-length segment without any colon ":" segment_nz_nc = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | @ )+" % locals() # path-abempty = *( "/" segment ) path_abempty = r"(?: / %(segment)s )*" % locals() # path-absolute = "/" [ segment-nz *( "/" segment ) ] path_absolute = r"/ (?: %(segment_nz)s (?: / %(segment)s )* )?" % locals() # path-noscheme = segment-nz-nc *( "/" segment ) path_noscheme = r"%(segment_nz_nc)s (?: / %(segment)s )*" % locals() # path-rootless = segment-nz *( "/" segment ) path_rootless = r"%(segment_nz)s (?: / %(segment)s )*" % locals() # path-empty = 0 path_empty = r"" ### FIXME # path = path-abempty ; begins with "/" or is empty # / path-absolute ; begins with "/" but not "//" # / path-noscheme ; begins with a non-colon segment # / path-rootless ; begins with a segment # / path-empty ; zero characters path = r"""(?: %(path_abempty)s | %(path_absolute)s | %(path_noscheme)s | %(path_rootless)s | %(path_empty)s ) """ % locals() ### Query and Fragment # query = *( pchar / "/" / "?" ) query = r"(?: %(pchar)s | / | \? )*" % locals() # fragment = *( pchar / "/" / "?" ) fragment = r"(?: %(pchar)s | / | \? )*" % locals() ### URIs # hier-part = "//" authority path-abempty # / path-absolute # / path-rootless # / path-empty hier_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) | %(path_absolute)s | %(path_rootless)s | %(path_empty)s ) """ % locals() # relative-part = "//" authority path-abempty # / path-absolute # / path-noscheme # / path-empty relative_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) | %(path_absolute)s | %(path_noscheme)s | %(path_empty)s ) """ % locals() # relative-ref = relative-part [ "?" query ] [ "#" fragment ] relative_ref = r"%(relative_part)s (?: \? %(query)s)? (?: \# %(fragment)s)?" % locals() # URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] URI = r"(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? (?: \# %(fragment)s )? )" % locals() # URI-reference = URI / relative-ref URI_reference = r"(?: %(URI)s | %(relative_ref)s )" % locals() # absolute-URI = scheme ":" hier-part [ "?" query ] absolute_URI = r"(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? )" % locals() if "__main__" == __name__: import re import sys try: instr = sys.argv[1] except IndexError: print "usage: %s test-string" % sys.argv[0] sys.exit(1) print 'testing: "%s"' % instr print "URI:", if re.match("^%s$" % URI, instr, re.VERBOSE): print "yes" else: print "no" print "URI reference:", if re.match("^%s$" % URI_reference, instr, re.VERBOSE): print "yes" else: print "no" print "Absolute URI:", if re.match("^%s$" % absolute_URI, instr, re.VERBOSE): print "yes" else: print "no"