what's the special symbol in a string

I have a string like below:

can anyone know what makes it become three lines? I need to remove it to become a normal string.

Thanks!

Yu

Answer 1

[Jan]

tmp(tmp < 32) = []

This remove all control characters, e.g. char(10), the line break.

[Yu Li]

thank you

Answer 2

[Sean de Wolski]

erase(tmp, newline)

[Yu Li]

this works as well, thank you so much!