Hi all! I need help to do a few things with a .txt file using egrep.
1. I need to list all sequences where the vowel letters 'a, e, i, o, u' occur in that order, possibly separated by characters other than a, e, i, o, u; consisting of one or more complete words, possibly including punctuation.

2. I need to list all lines where a 'word' is immediately repeated, ignoring any differences in case, and any intervening punctuation (i.e. "you. You" counts in this case).

3. List all words containing the longest possible cluster of consonants (^aeiouy) in the file.

4. I need to count the number of 'words' in the file.

5. I then need to sort these words in alphabetical order, then determine how many unique words are used in the text (the "vocabulary").

Can anybody please help me with this? I'm sorry if these seem to be very elementary questions - it's 2.15am and I'm braindead, and I've done 20 of the 25 questions without issue. These ones just have me stumped for some reason! Thanks for your help

University of Sydney, NSW, Australia, Dr Jason Johnston, LNGS2613