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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
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Task/Substring/Tcl/substring-1.tcl Normal file
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set str "abcdefgh"
set n 2
set m 3
puts [string range $str $n [expr {$n+$m-1}]]
puts [string range $str $n end]
puts [string range $str 0 end-1]
# Because Tcl does substrings with a pair of indices, it is easier to express
# the last two parts of the task as a chained pair of [string range] operations.
# A maximally efficient solution would calculate the indices in full first.
puts [string range [string range $str [string first "d" $str] end] [expr {$m-1}]]
puts [string range [string range $str [string first "de" $str] end] [expr {$m-1}]]
# From Tcl 8.5 onwards, these can be contracted somewhat.
puts [string range [string range $str [string first "d" $str] end] $m-1]
puts [string range [string range $str [string first "de" $str] end] $m-1]