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String match to \

Posted by enquirer (enquirer), 2 November 2002
How do I use the string match command to check whether a variable contains a string that ends with a \?

Posted by admin (Graham Ellis), 2 November 2002
gets stdin line

if {[string match *\\\\ $line] > 0} {
       puts "yes"
} else {
       puts "no"

You want to literally match a \ character, so the string match command needs to receive the special sequence \\ in a similar way to it would need to receive \* if it was to match an asterisk.

The Tcl interpretter also uses the \ as a special character, and in order to pass a \ through there it also needs an extra \ added for protection - to EACH of the two \ characters that you want to get through to the match pattern.  Thus you use \\\\ if you want to literally match a \.

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