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JavaScript introduced Perl-like regular expression support with Version 1.2. This reference covers Version 1.5 as defined by the ECMA standard. Supporting implementations include Microsoft Internet Explorer 5.5+ and Netscape Navigator 6+. JavaScript uses a Traditional NFA match engine. For an explanation of the rules behind an NFA engine, see Section 1.2.
JavaScript supports the metacharacters and metasequences listed in Table 1-41 through Table 1-45. For expanded definitions of each metacharacter, see Section 1.2.1.