Answer: argv@zipcode.com (Dan Heller) wrote:

If you don't need font or color changes, you can do all this using a Text
widget very easily [in Motif 1.1, anyway].

loop() {
    pos = offset_of_pattern_in_text_widget(pattern, text_w);
    search_len = strlen(pattern);
    XmTextSetHighlight(text_w, pos, pos+search_len,
                XmHIGHLIGHT_SELECTED);
}


There are two choices for highlighting: reverse video (HIGHLIGHT_SELECTED) and
underlined (HIGHLIGHT_SECONDARY_SELECTED).  Be careful that your users won't
confuse your highlights with actual selections!

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