I could not solve below problem so I used Perl script to parse 
without regular expression, but I believe there's a regular expression for it. 

*Input String* (there's no newline):

```
ObjectAddress=120.146.128.250,ObjectName=psyseds-tt1y,ObjectClass=SCM F5,ObjectDescription=,Aliases=psyseds-tt1y.site.com.,NameService=A,PTR,DynamicDNSUpdate=A,PTR,CNAME

```

*Expected Output*:

```
ObjectAddress=120.146.128.250
ObjectName=psyseds-tt1y
ObjectClass=SCM F5
ObjectDescription=
Aliases=psyseds-tt1y.site.com.
NameService=A,PTR
DynamicDNSUpdate=A,PTR,CNAME

```

I tried some regular expression to parse string, but I failed to parse 
since it has multiple items with `,` separated value. 
For example, NameService has two value A,PTR.

Please help me to build regular expression to parse above.
`(.+?=.*?)` does not pick up multiple values.