Method of initiating a text trim at a matching string?
I'm answering my own question... To eliminate a text string in an imported node, I used the Feeds Tamper "find replace regex" plugin on the node's body.The regex to find was:


  /(?=FirstWord )(.*)(?&lt;=LastWord[.])/s


Where FirstWord was the first word of the string to be eliminated, and LastWord[.] represented the last word of the string followed by a period. If you don't want to include punctuation, eliminate the [.] completely.

The trailing "s" indicates "single line mode," which makes the dot (before the asterisk) match all characters, including line breaks.

Of course, the replacement value was empty.