If its people from entering names you don't like, then you're SOL you'll never get a regex that handles every name in every culture.
Heck, you probably could even get one that handled American Hippies.).
Dark layers in varnish are rich in Mn and Ba, but poor in Si and Al.
Orange and yellow layers are poor in Mn and Ba, rich in Si and Al.
It’s changing from one context, in which a certain value is considered as safe, into another, in which the same isn’t considered as safe.
The microlaminations can be observed when varnish is shaved thin enough (5-10 µm) to see through with a light microscope.) and there are surly to many valid symbols to inlcude them all (and you will have Chinese symbols problem again).I would not put any constraints on a user name - it may even contain numbers; think of aristocratic names. No matter what regex you come up with, I can find a name somewhere in the world that will break it.Then you need to decide what you're trying to prevent.If its XSS you only need to stop malicious characters, and even then you need to be doing more.
Search for vmldating com:
Rock varnish microlamination (VML) dating uses the slow buildup of 'varnish' or dark coating on subaerially exposed rock surfaces.