Email clients add this line, call it "sender wrote" to reply emails.

strip or remove parentheses enclosed text - including the parentheses itself - only if the enclosed text does not contain any of the FULL keyword(s). Leave all parentheses enclosed text if it contains any keyword(s) listed in the regex string. Uses negative lookahead and \b for determining word boun...

^[_a-zA-Z0-9]+$ how to make regex username with underscore. i'm using c# but this regex isn't working.

This can be used to find all zone files that contain authoritative nameservers - e.g. perl -ne 'print if /^([\w.]+\.)\s+.+\sNS\s.+\1/' /var/named/*.db | awk '{print $1}' | sort | uniq

Matches any telephone number with region parentesis, or separated by points or dash or spaces

Get the content of a DIV HTML Tag.

This is a relaxed cron validation, meaning that any valid cron expression should pass this; but not anything that passes regex validation is a good cron expression. Used as preliminary validation in web ui. Supports all special characters. Includes seconds field.

Validates input to match UK Date Time standard

Pattern that matches all expression that not include a subexpression. The subexpression could be replaced by a string.

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