使用正则表达式在多义字符之间获取文件名

Question

I'm trying to fetch the file names which are in between multiple special character like '$$' ( example $$yaktocat.png$$) , i think it's better to ignore single special character $, if not we cannot use that character inside the file.

sample data

img src="$$yaktocat.png$$" alt="this is yaktocat image"

Regex trying to use

(\$+?(.*?)\$+?)

but still that match the single instance also

Answer 1

Do:

\$\$([^$]*)\$\$

Now the only captured group, ([^$]*) , will have the desired filename (eg yaktocat.png ), surrounded by $$ s.

Demo