Attributes starting with numbers are not valid

[danmihaila]

We had a file with attributes like "#affected+injured+dineo+2017" - starting with a digit which are not recognized as valid tag. Due to this, the file is marked as not having hxl tags even if it had other valid tags&attributes. Q: do we need to change the pattern to support attributes that starts with digit? note: this tag "#affected+injured+dineo+y2017" is valid