Too many a tag, the CPU will be 100% when there is no split

[Vanessa219]

Describe the bug
Too many a tag, the CPU will be 100% when there is no split.

To Reproduce
Steps to reproduce the behavior:

md is:

* 伪类：[:active](https://developer.mozilla.org/en-US/docs/Web/CSS/:active)、[:any-link](https://developer.mozilla.org/en-US/docs/Web/CSS/:any-link)、[:blank](https://developer.mozilla.org/en-US/docs/Web/CSS/:blank)、[:checked](https://developer.mozilla.org/en-US/docs/Web/CSS/:checked)、[:current](https://developer.mozilla.org/en-US/docs/Web/CSS/:current)、[:default](https://developer.mozilla.org/en-US/docs/Web/CSS/:default)、[:defined](https://developer.mozilla.org/en-US/docs/Web/CSS/:defined)、[:dir()](https://developer.mozilla.org/en-US/docs/Web/CSS/:dir)、[:disabled](https://developer.mozilla.org/en-US/docs/Web/CSS/:disabled)、[:drop](https://developer.mozilla.org/en-US/docs/Web/CSS/:drop)、[:empty](https://developer.mozilla.org/en-US/docs/Web/CSS/:empty)、[:enabled](https://developer.mozilla.org/en-US/docs/Web/CSS/:enabled)、[:first](https://developer.mozilla.org/en-US/docs/Web/CSS/:first)、[:first-child](https://developer.mozilla.org/en-US/docs/Web/CSS/:first-child)、[:first-of-type](https://developer.mozilla.org/en-US/docs/Web/CSS/:first-of-type)、[:fullscreen](https://developer.mozilla.org/en-US/docs/Web/CSS/:fullscreen)、[:future](https://developer.mozilla.org/en-US/docs/Web/CSS/:future)、[:focus](https://developer.mozilla.org/en-US/docs/Web/CSS/:focus)、[:focus-visible](https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible)、[:focus-within](https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-within)、[:has()](https://developer.mozilla.org/en-US/docs/Web/CSS/:has)、[:host](https://developer.mozilla.org/en-US/docs/Web/CSS/:host)、[:host()](https://developer.mozilla.org/en-US/docs/Web/CSS/:host())、[:host-context()](https://developer.mozilla.org/en-US/docs/Web/CSS/:host-context())、[:hover](https://developer.mozilla.org/en-US/docs/Web/CSS/:hover)、[:indeterminate](https://developer.mozilla.org/en-US/docs/Web/CSS/:indeterminate)、[:in-range](https://developer.mozilla.org/en-US/docs/Web/CSS/:in-range)、[:invalid](https://developer.mozilla.org/en-US/docs/Web/CSS/:invalid)、[:is()](https://developer.mozilla.org/en-US/docs/Web/CSS/:is)、[:lang()](https://developer.mozilla.org/en-US/docs/Web/CSS/:lang)、[:last-child](https://developer.mozilla.org/en-US/docs/Web/CSS/:last-child)、[:last-of-type](https://developer.mozilla.org/en-US/docs/Web/CSS/:last-of-type)、[:left](https://developer.mozilla.org/en-US/docs/Web/CSS/:left)、[:link](https://developer.mozilla.org/en-US/docs/Web/CSS/:link)、[:local-link](https://developer.mozilla.org/en-US/docs/Web/CSS/:local-link)、[:not()](https://developer.mozilla.org/en-US/docs/Web/CSS/:not)、[:nth-child()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child)、[:nth-col()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-col)、[:nth-last-child()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-child)、[:nth-last-col()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-col)、[:nth-last-of-type()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-of-type)、[:nth-of-type()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-of-type)、[:only-child](https://developer.mozilla.org/en-US/docs/Web/CSS/:only-child)、[:only-of-type](https://developer.mozilla.org/en-US/docs/Web/CSS/:only-of-type)、[:optional](https://developer.mozilla.org/en-US/docs/Web/CSS/:optional)、[:out-of-range](https://developer.mozilla.org/en-US/docs/Web/CSS/:out-of-range)、[:past](https://developer.mozilla.org/en-US/docs/Web/CSS/:past)、[:placeholder-shown](https://developer.mozilla.org/en-US/docs/Web/CSS/:placeholder-shown)、[:read-only](https://developer.mozilla.org/en-US/docs/Web/CSS/:read-only)、[:read-write](https://developer.mozilla.org/en-US/docs/Web/CSS/:read-write)、[:required](https://developer.mozilla.org/en-US/docs/Web/CSS/:required)、[:right](https://developer.mozilla.org/en-US/docs/Web/CSS/:right)、[:root](https://developer.mozilla.org/en-US/docs/Web/CSS/:root)、[:scope](https://developer.mozilla.org/en-US/docs/Web/CSS/:scope)、[:target](https://developer.mozilla.org/en-US/docs/Web/CSS/:target)、[:target-within](https://developer.mozilla.org/en-US/docs/Web/CSS/:target-within)、[:user-invalid](https://developer.mozilla.org/en-US/docs/Web/CSS/:user-invalid)、[:valid](https://developer.mozilla.org/en-US/docs/Web/CSS/:valid)、[:visited](https://developer.mozilla.org/en-US/docs/Web/CSS/:visited)、[:where()](https://developer.mozilla.org/en-US/docs/Web/CSS/:where)
* 伪元素：[::after (:after)](https://developer.mozilla.org/en-US/docs/Web/CSS/::after)、[::backdrop](https://developer.mozilla.org/en-US/docs/Web/CSS/::backdrop)、[::before (:before)](https://developer.mozilla.org/en-US/docs/Web/CSS/::before)、[::cue (:cue)](https://developer.mozilla.org/en-US/docs/Web/CSS/::cue)、[::first-letter (:first-letter)](https://developer.mozilla.org/en-US/docs/Web/CSS/::first-letter)、[::first-line (:first-line)](https://developer.mozilla.org/en-US/docs/Web/CSS/::first-line)、[::grammar-error](https://developer.mozilla.org/en-US/docs/Web/CSS/::grammar-error)、[::marker](https://developer.mozilla.org/en-US/docs/Web/CSS/::marker)、[::placeholder](https://developer.mozilla.org/en-US/docs/Web/CSS/::placeholder)、[::selection](https://developer.mozilla.org/en-US/docs/Web/CSS/::selection)、[::slotted()](https://developer.mozilla.org/en-US/docs/Web/CSS/::slotted)、[::spelling-error](https://developer.mozilla.org/en-US/docs/Web/CSS/::spelling-error) 

Expected behavior
CPU is normal

[Feder1co5oave]

Ouch.
/cc @davisjam

[Feder1co5oave]

The parenthesis in the [:host()] label throw off the link parsing rule:

md = `[:host()](https://developer.mozilla.org/en-US/docs/Web/CSS/:host())、[:host-context()](https://developer.mozilla.org/en-US/docs/Web/CSS/:host-context())、[:hover](https://developer.mozilla.org/en-US/docs/Web/CSS/:hover)、[:indeterminate](https://developer.mozilla.org/en-US/docs/Web/CSS/:indeterminate)、[:in-range](https://developer.mozilla.org/en-US/docs/Web/CSS/:in-range)、[:invalid](https://developer.mozilla.org/en-US/docs/Web/CSS/:invalid)、[:is()](https://developer.mozilla.org/en-US/docs/Web/CSS/:is)、[:lang()](https://developer.mozilla.org/en-US/docs/Web/CSS/:lang)、[:last-child](https://developer.mozilla.org/en-US/docs/Web/CSS/:last-child)、[:last-of-type](https://developer.mozilla.org/en-US/docs/Web/CSS/:last-of-type)、[:left](https://developer.mozilla.org/en-US/docs/Web/CSS/:left)、[:link](https://developer.mozilla.org/en-US/docs/Web/CSS/:link)、[:local-link](https://developer.mozilla.org/en-US/docs/Web/CSS/:local-link)、[:not()](https://developer.mozilla.org/en-US/docs/Web/CSS/:not)、[:nth-child()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child)、[:nth-col()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-col)、[:nth-last-child()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-child)、[:nth-last-col()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-col)、[:nth-last-of-type()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-of-type)、[:nth-of-type()](https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-of-type)、[:only-child](https://developer.mozilla.org/en-US/docs/Web/CSS/:only-child)、[:only-of-type](https://developer.mozilla.org/en-US/docs/Web/CSS/:only-of-type)、[:optional](https://developer.mozilla.org/en-US/docs/Web/CSS/:optional)、[:out-of-range](https://developer.mozilla.org/en-US/docs/Web/CSS/:out-of-range)、[:past](https://developer.mozilla.org/en-US/docs/Web/CSS/:past)、[:placeholder-shown](https://developer.mozilla.org/en-US/docs/Web/CSS/:placeholder-shown)、[:read-only](https://developer.mozilla.org/en-US/docs/Web/CSS/:read-only)、[:read-write](https://developer.mozilla.org/en-US/docs/Web/CSS/:read-write)、[:required](https://developer.mozilla.org/en-US/docs/Web/CSS/:required)、[:right](https://developer.mozilla.org/en-US/docs/Web/CSS/:right)、[:root](https://developer.mozilla.org/en-US/docs/Web/CSS/:root)、[:scope](https://developer.mozilla.org/en-US/docs/Web/CSS/:scope)、[:target](https://developer.mozilla.org/en-US/docs/Web/CSS/:target)、[:target-within](https://developer.mozilla.org/en-US/docs/Web/CSS/:target-within)、[:user-invalid](https://developer.mozilla.org/en-US/docs/Web/CSS/:user-invalid)、[:valid](https://developer.mozilla.org/en-US/docs/Web/CSS/:valid)、[:visited](https://developer.mozilla.org/en-US/docs/Web/CSS/:visited)、[:where()](https://developer.mozilla.org/en-US/docs/Web/CSS/:where)`
marked.InlineLexer.rules.link.exec(md) // doesn't terminate

edit: I think.
re-edit: was the parenthesis in link URIs, coupled with the high number of link tokens on a single line.