Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
 
This week, we're updating our course layouts and descriptions. Presentation and materials always gently change over time, but just occasionally there's a need to make a step change to clear out some of the old and roll in the new. That's now happening - but over a long and complex site it's not instant and you'll see sections of the site changing up to and including 19th September.

See also [here] for status update
 
String functions in TCL

Posted by shafa.fahad (shafa.fahad), 31 August 2006
Hi,

I am relatively new to TCL...

I have been trying to extract a particular string from a variable which has multiple strings. couldn't find the appropriate functions for it...

I have a variable var, i.e.,

set var "this is the string which i have"

Q: i want to check if the variable var has "which" in it, if so it should reutrn 1 else -1 (or even 0) ?

it would be helpful if i can get some ideas for the same





Posted by admin (Graham Ellis), 31 August 2006
set posn [string first which $var]

Will set posn to -i if "which" isn't in $var, or the position it starts at if it IS in there.  In Tcl, everything's a command, so do your test in square brackets.

If you write
if {[string first which $var] > -1} {
you can perform a test / select a piece of code based on whether or not "which" occurs in your string.

Posted by shafa.fahad (shafa.fahad), 31 August 2006
Thanks Graham,

That was really helpful...

Also I would like to know how to retrieve the string following the string which is found?

say,

set var "/usr/bin/ksh utils/mailMover ms01.mac.com"
if {[string first "/mailMover " $var] > -1} {
puts "Here it should print ms01.mac.com"
}

Please let me the appropriate function for the same....

Thanks in advance
Fahad

Posted by admin (Graham Ellis), 31 August 2006
In Tcl, everything's a command  

use the string first command to find the "break point", then the string range command to extract the part you want.   The code would read something like:

set lastpart [string range $var [string index " " $var] end]

Posted by shafa.fahad (shafa.fahad), 31 August 2006
Thanks Graham....  



This page is a thread posted to the opentalk forum at www.opentalk.org.uk and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2014: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • FAX: 01144 1225 899360 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho