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They should be processed with re.VERBOSE. Thanks Mark Nottingham for this code - https://gist.github.com/138549 """ from __future__ import unicode_literals import re # basics DIGIT = r"[\x30-\x39]" ALPHA = r"[\x41-\x5A\x61-\x7A]" HEXDIG = r"[\x30-\x39A-Fa-f]" # 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( ) def is_uri(uri): return re.match(URI, uri, re.VERBOSE) def is_uri_reference(uri): return re.match(URI_reference, uri, re.VERBOSE) def is_absolute_uri(uri): return re.match(absolute_URI, uri, re.VERBOSE)