Regular expressions mit Perl

URI encoding (RFC 2396)

s/([^\w()'*~!.-])/sprintf '%%%02x', ord $1/eg;   # encode

s/%([A-Fa-f\d]{2})/chr hex $1/eg;                # decode

UTF8 encoding

s/([\x80-\xFF])/chr(0xC0|ord($1)>>6).chr(0x80|ord($1)&0x3F)/eg;       # Latin-1 to UTF8

s/([\xC0-\xDF])([\x80-\xBF])/chr(ord($1)<<6&0xC0|ord($2)&0x3F)/eg;    # UTF8 to Latin-1

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