What is the command to get the list of branches created by a specific user in Clearcase ? Moreover, is there a command to get the list of branches by name using regular expressions ?
There is no support for regular expression.
You can list branches with a cleartool lstype -fmt "%n %u\n" -kind brtype, but you would still need to parse the result to get the one created by you.
Using the fmt_ccase options, you can display the creator and name of the branch, for you to parse.