in reply to really large regex misbehaving
See? Oh, and this is a helpful application of YAPE::Regex::Explain. Here's the output from explain. It'll explain what your regex is doing.@strings = ( 'x', '/*x*/', '"x"', '"\"', ); for (@strings) { while (/\G$REx/g) { print "$_ => '$1'"; } print ""; } __END__ x => 'x' /*x*/ => '/' /*x*/ => '*x*/' "x" => '"x"'
Warning: it is very long.
Edited 2001-05-22 by Ovid
(?x-ims: # group, but do not capture (disregarding # whitespace and comments) (case-sensitive) # (with ^ and $ matching normally) (with . not # matching \n): ( # group and capture to \1: ( # group and capture to \2: ( # group and capture to \3: \?+ # '?' (1 or more times (matching the # most amount possible)) | # OR ( # group and capture to \4: \? # '?' \/ # '/' | # OR \/ # '/' ) # end of \4 ( # group and capture to \5 (0 or more # times (matching the most amount # possible)): \? # '?' \/ # '/' )* # end of \5 (NOTE: because you're # using a quantifier on this capture, # only the LAST repetition of the # captured pattern will be stored in # \5) \?* # '?' (0 or more times (matching the # most amount possible)) ) # end of \3 | # OR ( # group and capture to \6: [^\'\"\/\s\?] # any character except: '\'', '\"', # '\/', whitespace (\n, \r, \t, \f, # and " "), '\?' | # OR ( # group and capture to \7: ( # group and capture to \8: \? # '?' | # OR \/ # '/' ) # end of \8 \?+ # '?' (1 or more times (matching the # most amount possible)) [^\s\?\"] # any character except: whitespace # (\n, \r, \t, \f, and " "), '\?', # '\"' ) # end of \7 | # OR ( # group and capture to \9: ( # group and capture to \10: \? # '?' \/ # '/' | # OR \/ # '/' ) # end of \10 ( # group and capture to \11 (0 or # more times (matching the most # amount possible)): \? # '?' \/ # '/' )* # end of \11 (NOTE: because you're # using a quantifier on this # capture, only the LAST repetition # of the captured pattern will be # stored in \11) ( # group and capture to \12: [^\'\"\/\s # any character except: '\'', \?\*] # '\"', '\/', whitespace (\n, \r, # \t, \f, and " "), '\?', '\*' | # OR \? # '?' ( # group and capture to \13: \?+ # '?' (1 or more times (matching # the most amount possible)) [^\?\"\s # any character except: '\?', ] # '\"', whitespace (\n, \r, \t, # \f, and " ") | # OR [^\'\"\/ # any character except: '\'', \s\?] # '\"', '\/', whitespace (\n, # \r, \t, \f, and " "), '\?' ) # end of \13 ) # end of \12 ) # end of \9 ) # end of \6 ( # group and capture to \14 (0 or more # times (matching the most amount # possible)): [^\'\"\/\s\?] # any character except: '\'', '\"', # '\/', whitespace (\n, \r, \t, \f, # and " "), '\?' | # OR \? # '?' \?+ # '?' (1 or more times (matching the # most amount possible)) [^\?\"\s] # any character except: '\?', '\"', # whitespace (\n, \r, \t, \f, and " ") | # OR ( # group and capture to \15: \/ # '/' | # OR \? # '?' \/ # '/' ) # end of \15 ( # group and capture to \16 (0 or more # times (matching the most amount # possible)): \? # '?' \/ # '/' )* # end of \16 (NOTE: because you're # using a quantifier on this capture, # only the LAST repetition of the # captured pattern will be stored in # \16) ( # group and capture to \17: [^\'\"\/\s\? # any character except: '\'', '\"', \*] # '\/', whitespace (\n, \r, \t, \f, # and " "), '\?', '\*' | # OR \? # '?' ( # group and capture to \18: \?+ # '?' (1 or more times (matching # the most amount possible)) [^\?\"\s] # any character except: '\?', # '\"', whitespace (\n, \r, \t, # \f, and " ") | # OR [^\'\"\/\s # any character except: '\'', \?] # '\"', '\/', whitespace (\n, \r, # \t, \f, and " "), '\?' ) # end of \18 ) # end of \17 )* # end of \14 (NOTE: because you're using # a quantifier on this capture, only the # LAST repetition of the captured # pattern will be stored in \14) ( # group and capture to \19: ( # group and capture to \20 (optional # (matching the most amount # possible)): \?+ # '?' (1 or more times (matching the # most amount possible)) | # OR ( # group and capture to \21: \/ # '/' | # OR \? # '?' \/ # '/' ) # end of \21 ( # group and capture to \22 (0 or # more times (matching the most # amount possible)): \? # '?' \/ # '/' )* # end of \22 (NOTE: because you're # using a quantifier on this # capture, only the LAST repetition # of the captured pattern will be # stored in \22) \?* # '?' (0 or more times (matching the # most amount possible)) )? # end of \20 (NOTE: because you're # using a quantifier on this capture, # only the LAST repetition of the # captured pattern will be stored in # \20) ) # end of \19 ) # end of \2 | # OR ( # group and capture to \23: ( # group and capture to \24: \' # ''' ( # group and capture to \25 (0 or more # times (matching the most amount # possible)): [^\'?\\] # any character except: '\'', '?', # '\\' | # OR \\ # '\' . # any character except \n | # OR \? # '?' ( # group and capture to \26: \?+ # '?' (1 or more times (matching # the most amount possible)) ( # group and capture to \27: \/ # '/' . # any character except \n | # OR [^?\/] # any character except: '?', # '\/' ) # end of \27 ) # end of \26 )* # end of \25 (NOTE: because you're # using a quantifier on this capture, # only the LAST repetition of the # captured pattern will be stored in # \25) ( # group and capture to \28: \' # ''' | # OR \? # '?' \' # ''' ) # end of \28 ) # end of \24 | # OR ( # group and capture to \29: \" # '"' ( # group and capture to \30 (0 or more # times (matching the most amount # possible)): [^\"\\?] # any character except: '\"', '\\', # '?' | # OR \\ # '\' . # any character except \n | # OR \? # '?' \?+ # '?' (1 or more times (matching the # most amount possible)) ( # group and capture to \31: \/ # '/' . # any character except \n | # OR [^\?\"\/] # any character except: '\?', # '\"', '\/' ) # end of \31 )* # end of \30 (NOTE: because you're # using a quantifier on this capture, # only the LAST repetition of the # captured pattern will be stored in # \30) ( # group and capture to \32: \" # '"' | # OR \?+ # '?' (1 or more times (matching the # most amount possible)) \" # '"' ) # end of \32 ) # end of \29 ) # end of \23 ) # end of \1 ) # end of grouping
|
|---|