In PHP3, I am using code which using the regular expression capability of 
PHP. The code matches all occurences of string prefixed by __ (2 
underscores) and having alphanumeric characters as well as _ (1 underscore) 
within it.

The code is as follows:

while (eregi("__([a-z0-9_]+)__", $ExpandedString, $Matches)) {

In PHP 4, the regular expression "__([a-z0-9_]+)__" does not seem to work. I 
tried "__([[:alnum:]_]+)__" also but that too did not work.

Looks like the problem is with combining two ranges and a literal within the 
regular expression....

Any solution would be appreciated?

With Regards,

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