|SED is available for VMS as well. Best is to get the freeware GNV package.|
Follow the freeware path at the VMS home page
Also PERL is availabe for VMS, follow the above opensource or freeware links at HP.
There a zillions of find-replace scripts on the the various perl archives.
You can as well use VMS editors like TPU/EVE, see examples in my utilities directory:
And interactive, using the EDT editor:
changes all strings "old" to "new" in file tmp.tmp.