Hello dear Monks,

I am badly stuck on this. Pleasee.. enlighten me as to how I should progress on the following problem on:

I have a file containing a set of lines with each line containing multiple sentences. I need to check each line for certain type of words (patterns) and extract them and their positions.

Word properties:
  1. variable in length.
  2. must contain letters and numbers (such as Hca12a).
  3. May or may not contain hyphen and underscore (such as PQRS12-a, Ma2_b).
  4. Letters in the word may be both in lower and upper case.

As output I need to get:
  1. the matched Word
  2. the sentence number (1st, 2nd and so on) in a line where the word occurs
  3. the position of the word from the start of the sentence.

Thanks a lot.
Raj

Edit: Fixed formatting by holli

In reply to Regex help by newbio

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