x <- c("PIA+1+TC_5504_00_312010_0050+50103 AB346 type 5334",
"PIA+1+TC_3444_00_312010_0133+0140",
"PIA+1+DRW/50488665600/01/000:DW",
"PIA+1+TC_5635_00_312019_2644+LoremIpsum",
"PIA+1+TC_5635_00_312010_0040+63503 AB346 type 5334",
"PIA+1+TC_5635_00_312018_0223+DolorSit",
"PIA+1+TC_5635_00_312019_2644+DolorSit")
grep("^PIA\\+\\d\\+(?!.*(?:LoremIpsum|DolorSit))", x, perl=TRUE, value=TRUE)
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