Making paired italic and boldface tags like those used by HTML for web pages.

HTML uses angled brackets to achieve effects, and places italicised text between and tags; and similarly boldface between and . We can mimic this very easily by setting each up as a segmented substitution:

"Chanel Version 1"
To say i -- beginning say_i -- running on: (- style underline; -).
To say /i -- ending say_i -- running on: (- style roman; -).
To say b -- beginning say_b -- running on: (- style bold; -).
To say /b -- ending say_b -- running on: (- style roman; -).
Place Vendôme is a room. "[i]Fashion fades, only style remains the same[/i] ([b]Coco Chanel[/b]). And this elegant drawing-room, once a milliner's shop, is a case in point."
Instead of going nowhere, say "[i]Don't spend time beating on a wall, hoping to transform it into a door.[/i] ([b]Coco Chanel[/b]) This one is a wall.".
Test me with "look / e".
Test me with "look / e".
Place Vendôme
Fashion fades, only style remains the same (Coco Chanel). And this elegant drawing-room, once a milliner's shop, is a case in point.

>(Testing.)

>[1] look
Place Vendôme
Fashion fades, only style remains the same (Coco Chanel). And this elegant drawing-room, once a milliner's shop, is a case in point.

>[2] e
Don't spend time beating on a wall, hoping to transform it into a door. (Coco Chanel) This one is a wall.

We have had to use square instead of angle brackets, but then, "in order to be irreplaceable one must always be different" (Coco Chanel).

(Marking these as substitutions which run on prevents unexpected paragraph breaks if they should appear immediately after the end of a sentence.)