What's the difference in this "string match"ing ... - TCL

MartinLemburg{}UGS schrieb:
> Hello,
>
> I traced down a problem I can not understand.
>
> Why is the following different? (perhabs the question is foolish or
> the answer is the easiest to find, but ...)
>
> % string match {*\\} "a\\"
> 1
> % string match "*\\" "a\\"
> 0
>
> Thanks for any hint!

The man page for string match states:
\x
Matches the single character x. This provides a way of avoiding the
special interpretation of the characters *?[]\ in pattern.

In your first example, string match substitutes the \\ with a single
\, in the second example it is already substituted by the parser and
string match gets a single \, which it interprets strangely.

Michael

MartinLemburg{}UGS wrote:
> Hello,
>
> I traced down a problem I can not understand.
>
> Why is the following different? (perhabs the question is foolish or
> the answer is the easiest to find, but ...)
>
> % string match {*\\} "a\\"
> 1
> % string match "*\\" "a\\"
> 0
>
> Thanks for any hint!
>

here's a hint

set a {*\\}
set b "*\\"

puts "length of a = [string length $a]"
puts "length of b = [string length $b]"

puts "a contains <$a>"
puts "b contains <$b>"


Bruce