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The Perl programming language is exceptional at parsing strings by providing a comprehensive regular expression language to the programmer. Rather than creating their own regular expression language, the developers of PHP made the Perl regular expression syntax available to PHP users. The Perl-style regular expression syntax was built from the POSIX regular expression syntax and thus hold many of the same features. In fact, PHP programmers can use many of the same POSIX regular expression syntax when using Perl-style regular expression syntax. The basic Perl-style regular expression syntax involves using forward slashes (/ /) to identify the pattern that will be searched for: /mysql/ will find any string that contains the pattern "mysql", /m+/ will find any string that contains the letter "m" followed by one or more characters (mysql, mom, mudd, my, etc.) and /m{2,4}/ will find any string that contains the letter "m" followed by 2 or 4 character