Regex For finding username:password

Detects valid Roman numerals (up to 3999), and splits into 4 capture groups: thousands, hundreds, tens, and units.

if you use the service you may want to know a state of some responses

Detect and cut lines containing variables.

bits and pieces of reusable replacements in CSS @font-face rules

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

Extract port from URL

Letras, Ñ, acentos, números, guión y barra baja

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

match the most common url stuctures

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

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

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