two strings that are different but... not really

Can someone help me to solve this?

> raw_stringDF1
[1] "\"Tranquille, 196 dossiers de détenus trouvés dans la rue (on les a)\" http://ift.tt/1lFP5Kd via @Rue89 "
> raw_stringDF2
[1] "\"Tranquille, 196 dossiers de détenus trouvés dans la rue (on les a)\" http://ift.tt/1lFP5Kd via @Rue89 "
> 
> raw_stringDF1 == raw_stringDF2
[1] FALSE
> 
> class(raw_stringDF1)
[1] "character"
> class(raw_stringDF2)
[1] "character"

The raw_stringDF2 has been extracted from a real data.frame.

The raw_stringDF1 has been created as a reproducible example to test a function.

The fact is that the function works with the reproducible example and not with my real data.

I then discovered that the real string is different from the reproduced string but... I don't understand how this is possible!