CODEWITHSUNDEEP
regexlistsplittcltk-toolkit
S.Gajjar
S.Gajjar

Reputation: 3

separating a string into different lists using tcl/tk

Is it possible to convert items of a string into a separate list for each item? set a [list "1.2 1.3 1.6 1.7 1.8"] and to have an output like {1.2}{1.3}{1.6}{1.7}{1.8}

Upvotes: 0

Views: 236

Answers (2)

Ruslan Rakhmanin
Ruslan Rakhmanin

Reputation: 393

getting list from a string. We are using whitespace " " as separator of list elements

set a [split "1.2 1.3 1.6 1.7 1.8" " "]

printing

foreach one $a {
    puts -nonewline "{$one}"
}
puts ""

Upvotes: 0

Donal Fellows
Donal Fellows

Reputation: 137567

We can use a regular expression to parse the string, and join to make something with the result:

set a "1.2 1.3 1.6 1.7 1.8"

set b [regexp -all -inline {\S+} $a]
set c "{[join $b "}{"]}"

Now, if we knew we had a proper list, we'd be able to skip the regular expression stuff, but it is safest to not do that.

We could also use regsub to do the transformation in this case.

set c [regsub -all {\s*(\S+)\s*} $a {{\1}}]

However, writing this sort of transformation can get quite a bit more difficult once the transformation required gets more complex.

Upvotes: 1

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