Check if a string contains the word word in it (case insensitive). If you have no idea, I guess you could try /word/.

Only match lines with the text start, unless text end appears prior to start. Note: end may or may not be in the string. Match start line_end; and don't match line_end; start

I'd like to know if a text contains words with 4 characters or more which are repeated 3 or more times in the text (anywhere in the text). If so, set one (and only one) backreference for each word.

Replace every . (dot) with a - (hyphen) except when the dot is surrounded by digits. E.g.: .a.b.1.2. should become -a-b-1.2-

Match a string that contains any of the following substrings: http://, www., porn, or credit card. But don't match the text if it contains one of: not allowed, filter, or mirc. Don't use word boundaries (anywhere in the text is fine). If you need help, try reading this.

I'm trying to match bit sequences which are alternating between 1 and 0 and never have more than one 1 or 0 in a row. They can be single digits. Try matching this: 0101010, 1010101010 or 1

Could you help me validate my input and only match positive integers between the range of 0 and 100? There can be several numbers in a string which I would want to retrieve. Try out these example strings: ...

Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.

capture Nth character from string, 3 times

Capture src attribute of HTML image tags

I am trying to extract the asp:label syntax using Regex but I am getting some error can some one help me

1/Jul/2013 03:27:12

Finds all source numbers in square brackets

match any string outside of single or double quotes

Extract resource location, name and query parameters from a URL

f_name may contain spaces, numbers, characters,... so I would go for a but then I couldn't use [...]? anymore to match the second line?