اسم المستخدم في الرسالة.

A natural Egyptian pronunciation would be:

esm el-mostakhdem fi r-risāla

A few notes:

• اسم is usually pronounced esm in Egyptian
• المستخدم is el-mostakhdem
• في is fi
• الرسالة is pronounced er-risāla because of sound assimilation with ر

If you say it slowly, it may sound like:

esm / el-mostakhdem / fi / er-risāla

Here is the breakdown:

• اسم = name
• المستخدم = the user
• في = in
• الرسالة = the message

So اسم المستخدم is one unit meaning the user's name or, in tech language, username.

Then في الرسالة means in the message.

Because this is an iḍāfa construction, often called a possessive construction.

In Arabic, when two nouns are linked like X of Y, the structure is:

• first noun: no ال
• second noun: can be definite

So:

• اسم المستخدم = the user's name / username

The first word اسم does not take ال here.

If you said الاسم المستخدم, that would usually mean something different, more like the used name or the name being used, not username.

It is both.

Literally, it means:

• اسم = name
• المستخدم = the user

So the literal sense is the user's name.

But in computer and app language, اسم المستخدم is also the normal standard Arabic term for username.

Arabic often leaves out is / am / are in the present tense.

So a sentence like:

• اسم المستخدم في الرسالة

can mean:

• The username is in the message

without needing a separate word for is.

This is very normal in Arabic, including Egyptian Arabic.

Depending on context, this could also just be a phrase or label, not necessarily a full conversational sentence.

Because ر is a sun letter.

When ال comes before a sun letter, the ل sound assimilates to the next consonant.

So:

• الرسالة is written with ال
• but pronounced er-risāla

You still write the ال, but in speech the l disappears and the r is emphasized.

This also happens in many other words, such as:

• الشمس → esh-shams
• الراجل → er-rāgel

The wording is understandable in both, but it sounds more formal/standard than casual everyday Egyptian.

Why:

• اسم المستخدم is the standard Arabic tech term
• Egyptian speakers absolutely understand it
• but in casual speech, many people might use English-based terms like يوزر نيم or mixed phrases

So this sentence is perfectly normal in interfaces, instructions, websites, or formal writing, even for Egyptians.

في is the normal word for in in both Egyptian Arabic and Standard Arabic.

So:

• في الرسالة = in the message

It is one of the most common prepositions in Arabic, and it is used very much like English in in this kind of sentence.

The final ة is called tāʾ marbūṭa.

In pause, or when the word stands on its own, it is usually pronounced -a in Egyptian Arabic:

• رسالة → risāla

The t sound usually appears only in certain grammatical environments, such as when the word is followed by another word in a construct or with some endings in more formal Arabic.

So here:

• الرسالة is pronounced er-risāla, not er-risālat

It can be understood either way, depending on context.

Possible uses:

• as a full sentence: The username is in the message
• as a label or short instruction fragment: Username in the message

Arabic often allows short verbless expressions like this, especially in menus, interface text, or notes. So context decides whether you should hear it as a complete sentence or just a compact phrase.