string map is replacing ? with a space

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1

Hi,

I’m doing a string map and the first ? after ad.imp in the replacement string is being replaced with a space. Strings below. How do I stop that?

string map “adserver/impression/pid=$pid/oid=$oid/rand=$rand/?click ad.imp?pid=$pid&oid=$oid&rand=$rand/?pclk”

Thanks

2

string map uses glob-style pattern matching which means that ? is a special character meaning “any one character”. If you need to match a literal ? you need to escape it:

string map “adserver/impression/pid=$pid/oid=$oid/rand=$rand/\?click ad.imp\?pid=$pid&oid=$oid&rand=$rand/\?pclk”

The same would be true of * [ and ]

http://www.tcl.tk/man/tcl8.4/TclCmd/string.htm

3

Hi David,

I think string match uses glob style matching, but I’m not sure about string map:

% string map “a?c def” abc

abc

% string map “a*c def” abc

abc

% string map “a?c def” a?c

def

% string map “a?c d?f” a?c

d?f

Aaron

4

The /worked. Thanks.