string function question in pl/sql

Have a string around 500 characters long, in which there is something like '...'. For example,

A String like

This is a special string, which contains some single quotation marks. 'Mark: we want to get the whole thing within the single quotation mark.' This is all we want to do.

How to get the substring out:

Mark: we want to get the whole thing within the single quotation mark.

Assume that the string is around 500 characters long.

Can any guru shed some light on it? Thanks in advance.
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All of the quotes in the above post are single quotes
jl66ConsultantAuthor Commented:
Appreciate your prompt help.
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