The C++ Standard Library Extensions A Tutorial and Reference

Chapter 19. Repetitive Searches

There are only two or three human stories, and they go on repeating themselves as fiercely as if they had never happened before.

O Pioneers!WILLA CATHER

Did you spot the problem with the example program that searched for code snippets in a text file at the beginning of Chapter 18? In lines that have multiple code snippets, everything between the first “<CODE>” and the last “</CODE>” is listed as a single snippet. To separate multiple snippets, we first have to change the regular expression a bit so that it doesn’t swallow multiple snippets. In this case, we can replace the “.*” with a nongreedy repetition:

string expr = " <CODE>(.*?) </CODE>";

Now, to resume searching after the text that matched, we have to change ...