Docs conversion for escapeRegExp method (again) now in v4.17.15

[LazaroOnline]

The issue:
#160
is occurring again in the latest v4.17.15 as @yejiajiehz mentioned in the original issue:

the backslash is not listed in the docs, instead it appears empty "".

[LazaroOnline]

Created a PR for this issue:
#233