🐛 FIX: MyST Role regex (#34)

Allow role names with digits 0-9

Author: chrisjsewell

markdown_it/extensions/myst_role/index.py

@@ -5,7 +5,7 @@
 from markdown_it.common.utils import charCodeAt, escapeHtml
 
 
-PATTERN = re.compile(r"^\{([a-zA-Z\_\-\+\:]{1,36})\}(`+)(?!`)(.+?)(?<!`)\2(?!`)")
+PATTERN = re.compile(r"^\{([a-zA-Z0-9\_\-\+\:]{1,36})\}(`+)(?!`)(.+?)(?<!`)\2(?!`)")
 
 
 def myst_role_plugin(md: MarkdownIt):