Apart from Corions request, please ask yourself the following questions

• How do I identify a year? (4 digits might do the trick)
• How do I identify a word? (any characters surrounded by blanks is probably a good start)

Now you may try to find the sequence "word word year word word" in your text. This can be done by a regex (Corion has already pointed to the docu). Regexes have also the possibility to loop through a string to find all occurences - check the docu.

Once the basics work, you can fine-tune as you want (word separated by colons, years like 100BC ...)

HTH Rata