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Doubt with regex to replace square bracket

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# 1  
Old 01-10-2013
Wrench Doubt with regex to replace square bracket
there is a word "welcome[world]"
output should be "welcome\[world\]

i am using regsub to add backslash "\" in place where ever i find square brackets (open or close)..
But i am not getting it... pls help out..

set a {welcome[world]}
set d [regsub -all "(?q)\[" "$a" /\[]
# 2  
Old 01-10-2013
Code:
x='welcome[world]'
echo $x | sed 's/\[\|\]/\\&/g'

# 3  
Old 01-10-2013
doubt again
thanks. can we do the same in tcl expect script.. pls help
# 4  
Old 01-10-2013
Code:
set a {welcome[world]}
regsub -all {\[} $a {\\[} a
regsub -all {\]} $a {\\]} d

puts $d

# 5  
Old 01-10-2013
can we do it in a single line???
# 6  
Old 01-10-2013
Code:
set a {welcome[world]}
regsub -all (\\\[|\\\]) $a {\\\1} a

puts $a

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