text1=c("photo: 11747918373 e1df250c19 2876","tags: china")
text2=c("photo: 11747918373 e1df250c19 2876","tags: china plane canon hongkong eos airport asia box aviation cargo airline 7d boeing dslr 3s heavy departure takeoff hkg 100400mm sar freighter clk widebody taxiing planespotting cheklapkok hkia haeco slw triple7 836 hongkonginternationalairport hongkongphotos 36003 daalc vhhh spota aerologic flickraward wwwairlinersnet 07r zensational shalowan worldtrekker b777f b77f germancargo b777fzn flickrtravelaward b777200flr superflickers b772flr christianjunker 36003836 ahkgap box513 germancargo513 3s513")



为什么以下两个 返回的值会不一样？是因为字段长度限制么？？

text1[grep("photo",text1)]

text2[grep("photo",text2)]


请问如何解决？