Regular Expressions 101

checks for ie 11 user agent

tes

A powerful regex (fewest steps possible) which gives you all the information about urls.

correctly handle the case where the value is splitted on multiple lines.

White space

Bob answers 'Whoa, chill out!' if you yell at him. You can use this regex to match regexes like "WHAT THE HELL WERE YOU THINKING?"

This version matches any sentence that sounds like yelling even it doesnt end with ? or !

should start with letter follow by letters and numbers and (-) - zero or more can't start or finish with (-) can't have two or more consecutive (-) char

Parses date-time duration strings +-1y2M3d4h5m6s, where 'm' is the dafault. Like this, where {} contains list of capturing groups: 21 - parsed as {,,,,21,} 2y2s - parsed as {2,,,,,2}

When looking for day, Sunday should not be matched.