PCRE version 3.7 29-Oct-2001

/^[\w]+/
    *** Failers
No match
    École
No match

/^[\w]+/Lfr
    École
 0: École

/^[\w]+/
    *** Failers
No match
    École
No match

/^[\W]+/
    École
 0: \xc9

/^[\W]+/Lfr
    *** Failers
 0: *** 
    École
No match

/[\b]/
    \b
 0: \x08
    *** Failers
No match
    a
No match

/[\b]/Lfr
    \b
 0: \x08
    *** Failers
No match
    a
No match

/^\w+/
    *** Failers
No match
    École
No match

/^\w+/Lfr
    École
 0: École

/(.+)\b(.+)/
    École
 0: \xc9cole
 1: \xc9
 2: cole

/(.+)\b(.+)/Lfr
    *** Failers
 0: *** Failers
 1: *** 
 2: Failers
    École
No match

/École/i
    École
 0: \xc9cole
    *** Failers
No match
    école
No match

/École/iLfr
    École
 0: École
    école
 0: école

/\w/IS
Capturing subpattern count = 0
No options
No first char
No need char
Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 

/\w/ISLfr
Capturing subpattern count = 0
No options
No first char
No need char
Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 
  À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö Ø Ù Ú Û Ü Ý Þ ß à á â ã ä å 
  æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ø ù ú û ü ý þ ÿ 

/^[\xc8-\xc9]/iLfr
    École
 0: É
    école
 0: é

/^[\xc8-\xc9]/Lfr
    École
 0: É
    *** Failers 
No match
    école
No match

/ End of testinput4 /

