String Match and Replace

[oldtimer47]

ksh:
I need to match and replace a string. The string is set in a variable. Is there a simple command or way to do it? (ex. in ksh93 there's ${var/pattern/replace})

I've been away from unix scripting for a while, I'm rusty ...

 

[cptk]

use the sed editor...
sed /s/pattern/replcement/[flag]

example
>echo "abc xyz" | sed s/xyz/123/g
returns "abc 123"

Note: the g is optional - used to to replace all instances of pattern on line (not just first)