... $v_Output = preg_replace("/[^a-z0-9\_]/", "_",$v_Output);
// replace any consecutive underscores to a single one (eg. "my_____test" yields "my_test")
$v_Output = preg_replace("#((\_))\\2+#", ...
... class is the name of the POSIX character class to search for. For example, to search for one or more consecutive uppercase characters, use the following regular expression:
[[:upper:]]+
This expression ...
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