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ordering a group of symbolic operators

• To: mathgroup at smc.vnet.net
• Subject: [mg128316] ordering a group of symbolic operators
• From: Yaj <ybhattacharya at gmail.com>
• Date: Sat, 6 Oct 2012 01:51:52 -0400 (EDT)
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Appreciate any help with the following (newbie to Mathemtica)

I have a following expression, consisting of groups/strings of symbolic operators

phi_c.delta_a.phi_b.delta_c + delta_c.phi_c.delta_f.phi_c + ...

Need to rearrange the above such that all the phi-s are on the left and all the deltas are on the right, i.e. REWRITE the above as

phi_c.phi_b.delta_a.delta_c + phi_c.phi_c.delta_c.delta_f + ....

The order of the (phi)s i.e. whether phi_c is to the left of phi_b doesn't matter, but all the (phi)s must be towards the left of all (delta)s in each string. 

Please note that the (dots) are not necessarily multiplication.