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""" 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. Thanks Mark Nottingham for this code - https://gist.github.com/138549 """ 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( ) # IPv6address IPv6address = r"([A-Fa-f0-9:]+[:$])[A-Fa-f0-9]{1,4}" # 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<pchar> 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)