Pulling specific values from weblog. In this case, the OS.

Verifies a cron schedule pattern such as: 10:45 or multiple times such as: 11:00 22:10 23:15

Validates a string for valid cron schedules such as 10:45, 11:15 etc.

match the most common url stuctures

search text matching any word

replace token like [foo:bar:ba zz]

Grep the daily purchase price for 250 g gold from http://www.scheideanstalt.de/aktuelle-ankaufskurse/ankaufskurse-barren/: gold=$(wget -q -O- http://www.scheideanstalt.de/aktuelle-ankaufskurse/ankaufskurse-barren/ | grep "250 g" | sed -r 's/^.250 g]>([0-9]+)\.([0-9]+[0-9]+[0-9]+)\,([0-9]+[0-9]+).*$...

Extract port from URL

Identifies two groups, each group using a regex, then replaces group 2 with group 1.

The file name validation algorithm from MS KB905231, I assumed the prohibited suffixes included the file extension. I.e. 'foo.doc.files' would not match but 'foo.files.doc' would.

Detect and cut lines containing variables.