17. The system of claim 15 , wherein computation and determination further comprises reduction of the Levenshtein distance value between a group of words and the text, on detection that the Levenshtein distance value between the group of words and the text is within a first threshold, wherein reduction of the Levenshtein distance between a group of words and the text is based on a correlation of characters that contribute to the Levenshtein distance value with one or more characters commonly misinterpreted by an OCR process; and wherein determination further comprises identification of the group of words as an instance of the text when the reduced Levenshtein distance value is within a second threshold.
15. The system of claim 12 , wherein the redaction module is to further identify groups of words within the document as instances of the text from the document by computation of respective Levenshtein distance values between the groups of words and the text, and a determination of whether each Levenshtein distance value is within a determined threshold.