Regex Injection

Regular expressions ( regex) are often used in web-development to describe which characters appear in a string, and how they are ordered.

| ab c* | matches a string that has ab followed by zero or more c's | | ab c+ | matches a string that has ab followed by one or more c's | | ab c? | matches a string that has ab followed by zero or one c's | | ab c2 | matches a string that has ab followed by cc | | ab c{2,} | matches a string that has ab followed by 2 or more c's | | ab c{2,5} | matches a string that has ab followed by 2 up to 5 c's | | a (bc)* | matches a string that has a followed by zero or more copies of the sequence bc's | | a (bc){2,5} | matches a string that has a followed by 2 up to 5 copies of the sequence bc's |