Clean install of Wordpress has errors on admin login

I have a server which has a couple of wordpress installations, one on one domain which works fine (it is a client's so I don't have access to its admin console) and one which does not work correctly (another client, but I do have access to this one).

If you remove all traces of WP from the domain on the server, download the latest version, unzip it, upload it, create the MySQL database and user, run the config, then I get an error that it could not write the config file and tells me to copy and paste which I do without a problem, upload the config file, then log into the admin part of the new empty site I get these three errors at the top of the screen:

Warning: preg_match_all(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/compat.php on line 30

Warning: array_slice() expects parameter 1 to be array, null given in /home/safadm/public_html/wp-includes/compat.php on line 31

Warning: implode(): Invalid arguments passed in /home/safadm/public_html/wp-includes/compat.php on line 32

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I also get errors under the different sections of the dashboard such as under Plugins I get this:

Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

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Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset -1 in /home/safadm/public_html/wp-includes/SimplePie/Misc.php on line 1926

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virtually identical errors appear under the "WordPress Blog" and "Other WordPress News" sections as well.

I have called the people we lease the server from and they first suggested an update to PHP and Apache rebuild (PHP was 5.3.?, now is 5.4.?) and this had no effect. The server is running CentOS 5.9, WHM 11.34.1 (build 12) and Apache 2.0.64.

I found another possible solution to do with pcre so I ran:

sudo yum upgrade '*php*' pcre

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followed by restarting the Apache service, no change. I then rebooted the server just to be sure, no change.
AMPLECOMPUTERSAsked:
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AMPLECOMPUTERSConnect With a Mentor Author Commented:
Looks like PHP did an update which broke PCRE. Had a heck of a time updating everything, required an update to Apache from 2.0 to 2.2, PHP from 5.3 to 5.4, PCRE from 6.6 to 8.33 and finally had to compile in support for suPHP and switch to using CGI for PHP requests.
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Jason C. LevineNo oneCommented:
and one which does not work correctly (another client, but I do have access to this one).

Has the client attempted to customize the server environment in any way?
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AMPLECOMPUTERSAuthor Commented:
Not that I am aware of. I checked everything I could think of and it seems set to default.
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AMPLECOMPUTERSAuthor Commented:
I just went into another account which has never had anything done to it (used strictly for email access) and did an install of WordPress with the same results, errors everywhere.

It seems to be a server problem, something not agreeing with something I would suspect but I have no idea where to look.
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AMPLECOMPUTERSAuthor Commented:
That fixed it
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