We have "getfield" I need "trimfield"

Gurus

This is one of those things you'd think is super simple but I've been pulling my hair out.

There appear to be many ways to trim any occurence of a char/string within another string like a uri but it's always ANY ocurrence.

I want just the FIRST one trimmed. Basically I'm looking for the exact thing "getfield" does except that I wanna trim it when found so

"trimfield" ? I'd look into regex substitution but I know you should not ever use those if you can help it.

My scenario is simple. I just need to cut the first ocurccence of "/rma/" from a uri as part of a re-direct but the uri contains other instances of this string

later in various forms. Example:

/rma/rma.htm?_flowExecutionKey=_somestring

should become:

/rma.htm?_flowExecutionKey=_somestrin

or:

/rma/rma/something&rma=blalb

should become

/rma/something&rma=blalb

I have a dgl called "trim_left_uri" and I figured trimleft is the way to go so I added the string "/rma/" to the dgl and use the following code:

Check if uri needs left trimming

problem is that trims this :

/rma/rma.htm?_flowExecutionKey=_somestring

to this:

/.htm?_flowExecutionKey=_something

I'm looking to trim the string literal "/rma/' not the character class [/rma].

Every other way to do this I've found has the same limitation where it's all or nothing for example "string map" - same issue.

It appears to me the easiest way to solve this would be to say "Split the uri by / and trim field 2" - done.

However, I cannot find such a command. Do I need the old regex subsitution after all ?

In bash that would be :

echo '/rma/rma/rma.htm/rma/flowExecutionKey=_mra' | sed 's%^/rma/\(.\+\)%\/\1%g'

--scratching head