tcl query for regular expression

[incisive]

tcl regular expressions

Hello all,


suppose i need to search atom from a group of lines from a file,

for example file is

item
list
atom [3:0] grant;
ready


here i need to change the 3rd line from "atom [3:0] grant" to "atom [7:0] grant" what is the necessary regular expression to do the above.

i will be helpful if some gives some sought of clue to solve the above

thanks
incisive.

 

[microe_victor]

Hello all,


suppose i need to search atom from a group of lines from a file,

for example file is

item
list
atom [3:0] grant;
ready


here i need to change the 3rd line from "atom [3:0] grant" to "atom [7:0] grant" what is the necessary regular expression to do the above.

i will be helpful if some gives some sought of clue to solve the above

thanks
incisive.

hi , you can have a try with the regular expression below.

% set a {atom [7:0]}
atom [7:0]
% regsub -all {(^atom[ \t]*\[)[0-9]+(\:0\])} $a {\17\2} c
1
% puts stdout $c
atom [7:0]
%

 

[incisive]

Thank you microe_victor,

Even i found out a simple expression which changes the given value accordingly.

i.e

regsub {\[3:0\]} $sample3 {[7:0]} sample5

well thanks again!!

 

[microe_victor]

Thank you microe_victor,

Even i found out a simple expression which changes the given value accordingly.

i.e

regsub {\[3:0\]} $sample3 {[7:0]} sample5

well thanks again!!

You are welcome.

in this case " regsub {\[3:0\]} $sample3 {[7:0]} sample5 " all the patten [3:0] would be replaced by [7:0] ,so please be careful