Thanks for your interest!
Currently, you can use TextFragementAbsorber with regular expression as an input parameter.
// Create TextFragmentAbsorber object that searches all words starting 'h'
// and ending 'o' using regular expression.
TextFragmentAbsorber absorber = new TextFragmentAbsorber(@"h\w*?o",
Unfortunately, ParagraphAbsorber doesn't support search by the regular expression, so you need to analyze paragraphs extracted with this tool manually.
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