set some_string "Name/is/ComplexSTRUCTUre"
convert this string to,
some_string = "Name/is/ComplexSTR.CTUre"
i.e replacing first "U" to "."
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3 Answers
Try This,
set replaced_string [regsub "U" $some_string "."]
puts $replaced_string
Another Option,
set pos [string first "U" $some_string]
set replaced_string [string replace $some_string $pos $pos "."]
puts $replaced_string
Here your "Name/is" portion should not contain any "U"
More information can be found here tcl string replacement
Comments
Use of regsub is overkill for plain strings. If you simply wish to replace one set of substrings with another, string map is your friend:
set s "Name/is/ComplexSTRUCTUre"
set s [string map {U .} $s]
This, however, will replace all Us with dots -- as your question's title suggests.
If, however, you want only the first U replaced -- as the text of your question implies, then AxT_8041's second option is the most suitable.
1 Comment
toxic_boi_8041
string map don't allows user to change only first occurrence. it changes every occurrence of U with dot which is not OP's need. Still if you want change all occurrence thn string map is nice and sweet optionyou can use:
string replace <num1> <num2> <To_be_replaced>
example:
set a [get_attr [get_cells -filter <cell_name> ] ref_name]
<cell_name>
string replace 5 8 NAME
<cell_NAME>
