Turns Gyazo page links into PNG links (useful for auto-previews, embedding etc.)

Match with courses like: AB123, AB 123, ABC123 or ABC 123

Matches the template literals in a given string

Regular expression to exclude a filename path.

Grabs the last "." of a string, and any word characters (\w) that follow.

Removes space after opening and before closing square and reqular brackets/parenthesis and keeps what's inside

List of phone numbers separated by commas 241 214 2414,(214) 224 4244, 214/224 4224,2142244244

t01

搜索句子中的小写单词

https://www.w3.org/TR/html5/forms.html#valid-e-mail-address

it matches the code in JS, assumes that at least one function is defined to match with.