I think you can't do without a little manual work, but maybe you can limit the number of cases you have to change by hand.
- The beginning underscore has in most cases a blank in front of it - unless it is the beginning of a sentence -, so you should be able to search for "blank+_".
- The closing underscore is in most cases followed by a blank, a comma, a point or a question/exclamation mark - make use of this.
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