Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
Regular expressions are written in a terse and cryptic notation. JSLint looks for problems that may cause portability problems. It also attempts to resolve visual ambiguities by recommending explicit escapement.
JavaScript's syntax for regular expression literals overloads the / character. To avoid ambiguity, JSLint expects that the character preceding a regular expression literal is a ( or = or : or , character.