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uri_validate.py
Python
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#!/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.
"""
 
 
### 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<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()
 
 
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"

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