Added specifying ordinal hash tag positions

[bitthegeek]

if the start hash tag character is the same as the end hash tag character, only the first hash tag will be used

hash_tag: __
1_2_3_4 -> 2

Applying ordinal hash tag positions, you can get the nth hash tag if multiple hash tags exist, reverts to whole key if nth hash tag is not found

hash_tag: __
hash_tag_pos: 2
1_2_3_4 -> 3

hash_tag:__
hash_tag_pos: 2
1_2_3 -> 1_2_3

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}