[Orgmode] use of =code= formatting,

[François Lagarde]

Hello,

My org version is 4.73. 

I can not jointly use the formatting convention = and _. 

For example, =_MyClass= will be interpreted as a subscript:
<code><sub>MyClass</sub></code>. 

My intention was obviously to only have <code>_MyClass</code>.

How can I keep untouched the text between the code delimiters.

thanks.

-- 
François Lagarde