![]() JavaScript and VBScript implement Perl-style regular expressions. VBScript regular expressions also still use the IE 5.5 implementation, even when a modern version of IE is installed. In standards mode, modern versions of IE follow the JavaScript standard very closely. Modern versions of IE still use the IE 5.5 implementation when rendering web pages in quirks mode. Therefore, everything said about JavaScript’s regular expression flavor on this website also applies to VBScript. Fortunately, most are corner cases that are not likely to affect you. There are quite a few differences between its implementation of JavaScript regular expressions and the actual standard. ![]() But IE 5.5 did not score very high on web standards. Whenever this website mentions VBScript, the statements refer to VBScript’s version 5.5 regular expression support.īasically, Internet Explorer 5.5 implements the JavaScript regular expression flavor. Version 5.5 implements quite a few essential regex features that were missing in previous versions of VBScript. Microsoft made some significant enhancements to VBScript’s regular expression support in version 5.5 of Internet Explorer. ![]() If you use VBScript to validate user input on a web page at the client side, using VBScript’s regular expression support will greatly reduce the amount of code you need to write. VBScript has built-in support for regular expressions.
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