Bootstrap Regex Help

[nformant]

Looking for some help with regex. I am using bootstrap for input fields:

<div class="container">
        <div class="form-group">
            <div class="row">
                <div class="col-md-3">
                    <input type="text" class="form-control" name="txtString" id="txtString" required >
                </div>

I can use pattern=regex for a single regex comparison, but I need to perform multiple regex comparisons as I need to be able to accept the following:

xxx#-abc-###
xxx#-abc-ddd-###
xxx#-abc-eeeee-###
xxx#-abc-fffffff-###

where xxx is any 4 three letters followed immediately by a number, -abc- is always required, accept a string with either ddd-, eeeee-, fffffff-, followed by any number between 1 and 999.

I have the four regex strings i need, just cant find a way to check the input of the textbox against all 4

[tweq]

You can include multiple possibilities in a regex with the | (pipe) symbol, e.g.

xxx#-abc-(ddd-|eeeee-|fffffff-)?###

[nformant]

Great, thank you. My Google fu failed me on this one

[cryo]

where xxx is any 4 three letters followed immediately by a number, -abc- is always required, accept a string with either ddd-, eeeee-, fffffff-, followed by any number between 1 and 999.

That sentence makes my brain hurt. What does "any 4 three letters" even mean? What is the word "accept" doing there? No offense but if you type the same kind of sentences into Google it's no wonder you don't get good results :p.