`df_news$role1` in text chapters

[sammo3182]

When compiling the text chapters, e.g., drhur("classify", lang = "en"), stop at

drhur/inst/tutorials/classify_en/classify_en.Rmd

Line 53 in a3aec2e

df_news$role1 <- str_extract(df_news$content, pattern = paste(ls_names[1:12], collapse = "|")) # after the 12th are post docs and research fellows

for a not-matching error.

The error only appears when running the drhur command. There's no problem compiling the tutorial by isolatedly running the rmd file.