Use Flag re to extract flags from lines

[Flozza]

Sometimes flags are given with junk around them. Use the regex to extract them using grouping. We could also experiment with splits so we could extract multiple flags on a single line.

The one thing we will not do is extract flags split across lines (unlikely we will get those, get your exploit in line!)

[Flozza]

Fix #40 (Extract flag with regex)

Also extend testexploit to test it

→ <<cset aaa14fbd50fb>>