Chapter 10 Pattern Matching Using Regular Expressions

A regular expression is an object that describes the character mode. The Regexp class in Javascript represents a regular expression, while both string and Regexp define functions that use regular expressions for powerful pattern matching and text retrieval and replacement.

Javascript 1.2 implements regular expressions of Perl 4, and JavaScript 1.5 implements a large subset of regular expressions of Perl 5.

Create a Regexp object:

Direct amount of regular expressions

Constructor Regexp ()

If you cannot remember the punctuation marks that need to be escaped using a backslash, you can use a backslash before each punctuation mark. On the other hand, it should be noted that many letters and numbers also have special meanings when they are prefixed with a backslash. Therefore, do not use a backslash to escape the letters and numbers that you want to directly match. To add a backslash that is understood as a direct amount in a regular expression, you must use a backslash to escape it.