Chapter 6 Advanced Expressions: Parsing HTTP, TCP, and UDP Data 133
text.SET_TEXT_
MODE(BACKSLASH_ENCODED|NO_
BACKSLASH_ENCODED)
Specifies whether or not backslash decoding is
performed on the text object represented by text.
If BACKSLASH_ENCODED is specified, the SET_
TEXT_MODE operator performs the following
operations on the text object:
• All occurrences of “\XXX” will be replaced
with the character “Y” (where XXX represents
a number in the octal system and Y represents
the ASCII equivalent of XXX). The valid range
of octal values for this type of encoding is 0 to
377. For example, the encoded text "http\72//"
and "http\072//" will both be decoded to "http:/
/", where the colon (:) is the ASCII equivalent
of the octal value “72”.
• All occurrences of “\xHH” will be replaced
with the character “Y” (HH represents a
number in the hexadecimal system and Y
denotes the ASCII equivalent of HH. For
example, the encoded text "http\x3a//" will be
decoded to "http://", where the colon (:) is the
ASCII equivalent of the hexadecimal value
“3a“.
• All occurrences of “\\uWWXX” will be
replaced with the character sequence “YZ”
(Where WW and XX represent two distinct
hexadecimal values and Y and Z represent their
ASCII equivalents of WW and XX respectively.
For example, the encoded text "http%u3a2f/"
and "http%u003a//" will both be decoded to
"http://", where “3a” and “2f” are two
hexadecimal values and the colon (:) and
forward slash (“/”) represent their ASCII
equivalents respectively.
• All occurrences of "\b", "\n", "\t", "\f", and "\r"
are replaced with the corresponding ASCII
characters.
If NO_BACKSLASH_ENCODED is specified,
backslash decoding is not performed on the text
object.
text.SET_TEXT_MODE(BAD_
ENCODE_RAISE_UNDEF|NO_BAD_
ENCODE_RAISE_UNDEF)
Performs the associated undefined action if either
the URLENCODED or the BACKSLASH_
ENCODED mode is set and bad encoding
corresponding to the specified encoding mode is
encountered in the text object represented by text.
If NO_BAD_ENCODE_RAISE_UNDEF is
specified, the associated undefined action will not
be performed when bad encoding is encountered in
the text object represented by text.
Operations That Evaluate HTML and XML Encoding
HTML or XML Operation Description