Words and regular expression detectors in files

1. The project should be developed in GO language
2. The application input is list of words and/or regular expressions + file to search in
3. File can be of type
3.1 *.txt, *.rtf, *.xml, *.html
3.2 Any MS office - word, excel, power point (note that word and power point can include text and images)
3.3 PDF
3.4 Any image (images can contains text, need to use OCR to convert the image to a text format)
4. The output of the execution is where in the file any of the input words or regExp found

example:
Input is two words and one regular expression (the reg exp describe purchase order number) separated by comma "hello, world, (\W|^)po[#\-]{0,1}\s{0,1}\d{2}[\s-]{0,1}\d{4}(\W|$)
second input is .doc file
if and of the words or purchase order are in the document, the output should be where in the file