How do you call...

Question

....things like \n \d \W ?

And is there a List, where i can find them all including explenation?

Trank you all for your help

Answer 1

I found \d and \W.
They are called metacharacters and are used, if you want your program to match something.
As I mentioned before, I found them in a code searching for characters in a password.
Now it is clear to my, what exactly it does.

Want to see, if the password matches any digit (0-9) than use \d
Want to see, if the password matches any NON alphanumeric character, than use \W

Answer 2

This covers most of it used in Java.
https://www.geeksforgeeks.org/escape-sequences-in-java/

Answer 3

I hope this link will help https://www.freeformatter.com/java-dotnet-escape.html

Answer 4

thank you all a lot. now i learned, they are called „escape sequences“ and i got two lists. Maybe i will find some more.

there must be also \d and \W.
\d for charakters like &€@!
\W for whitespaces.
i found both in a code, that checked, if there were numbers, charakters such as shown above and spaces in a password.
so i guess, they must be also kind of escape sequences

Answer 5

why are they called metacharactets?
see the link from Ashish Kumar and scrol down. i might be wrong, but it is interesting