These snippets are designed to be dropped into any website, regardless of its underlying framework or structure. They are all ...

Regular expressions -- often called regex -- are sequences of characters that define a search pattern in text. That makes them sound like a one-trick pony, but you'd be surprised at how useful ...

JavaScript standard regular expression package, RegExp, and many other widely used regular expression packages such as PCRE, Perl and Python use a backtracking implementation strategy: when a pattern ...

Compiled regular expressions only do this once, which makes them much faster than standard regular expressions, although they cannot be used if the pattern changes. The negative here is that the ...

In this case, CloudFlare was trying to use this regular expression to block inline JavaScript. While it isn't made particularly ... Catastrophic backtracking is caused by patterns that can produce ...

A full-blown programming language like Java or Python can do many things, but regex does one thing only: match text against patterns. An individual regular expression is expressed as a string of ...

Regular expressions ... Some programming languages, such as JavaScript, allow the inclusion of ‘flags’ after the regex pattern itself, and these can further affect the outcome: g Returns ...