Ignore some characters

[badbye]

Is it possible to do some configuration to ignore some characters? For example, forbidden to use the _ character.

I am using Mathjax to render the latex equations, however sometimes marked convert $x_1y_1$ to $x<em>1y</em>1$.

[badbye]

I find the rules of em and try to edit it, however it does not work.

> marked.InlineLexer.rules.em
/^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/

> marked.InlineLexer.rules.em = /^\*((?:\*\*|[\s\S])+?)\*(?!\*)/

> marked('_hi_')
"<p><em>hi</em></p>
"

[badbye]

Alright, I see. Here is my solution:

> marked.InlineLexer.rules.gfm.em = /^\*((?:\*\*|[\s\S])+?)\*(?!\*)/

> marked('_hi_')
"<p>_hi_</p>
"

Please let me know if there is a better solution.

[Jiang-Xuan]

you want to output '_' char ?
you can escape some char.
for example:

marked('\\_hi\\_')

PS: I am a Chinese boy is not good at English and javascript.Please don't keep in mind if I say something wrong.

[Jiang-Xuan]

@badbye
If you edit marked.InlineLexer.rules.em to /^\*((?:\*\*|[\s\S])+?)\*(?!\*)/.

_marked_ can not to generate em element

[Feder1co5oave]

It's as if you asked the C compiler to not parse plus signs, they're part of the language and they have semantics too.

[joshbruce]

See #936 - closing as covered by another issue or request. Integrating math.