Common bstr class augments
| x | A character vector which convert to a bstr object. | 
| n | A character vector which is name of x. | 
| ucase | A logical. If TRUE the x is converted to upper case. (default: FALSE) | 
| bstrobj | bstr class object or character vector | 
| dstrobj | dstr class object or character vector | 
| pstrobj | pstr class object or character vector | 
| pattern | regex pattern | 
| case_sensitive | sensitive to case in pattern (default:FALSE) | 
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