how to find container Index in dct

suppose we have /article/article_language[1]/category

i need to get index value. how to get container index value.

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suppose we have /article/article_language[1]/category

i need to get index value. how to get container index value.

It helps if you provide a bit more context to the code in which you are attempting to get this information.

If you were just handed that 'path' - you could do it with a regex.
If you were iterating through a node (for example, using getChildren()), then you could easily keep track of the index value while iterating.