functionList/asm.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!-- ==========================================================================\
|
|   To learn how to make your own language parser, please check the following
|   link:
|       https://npp-user-manual.org/docs/function-list/
|
\=========================================================================== -->
<NotepadPlus>
	<functionList>
		<!-- ==================================================== [ Assembly ] -->

		<parser
			displayName="Assembly"
			id         ="assembly_subroutine"
			commentExpr="(?x)                                               # Utilize inline comments (see `RegEx - Pattern Modifiers`)
							(?m-s:;.*$)                                     # Single Line Comment
						"
		>
			<function
				mainExpr="(?x)                                              # Utilize inline comments (see `RegEx - Pattern Modifiers`)
						(?m)^\h*                                            # optional leading whitespace
						\K                                                  # keep the text matched so far, out of the overall match
						[A-Za-z_$][\w$]*                                    # valid character combination for labels
						(?=:)                                               # up till the colon
					"
			/>
		</parser>
	</functionList>
</NotepadPlus>