I dont understand what the \1 does. I know if i remove it it removes all
the characters before the 10th and if i include it in keeps them. Why is
When you put a regexp in round brackets, what it matches is remembered.
In a replacement string, you can then refer to them as \1, \2, etc.
oh and a totally newb question but when i try to substitute the asterix
with a newline \n it just prints it instead of creating a newline, why
Since the replacement string is in single quotes, \n is not special so
represents the two characters \ and n. To get a newline, you need to
put \n in double quotes ("\n"). In double quotes, the backslash quotes
any character, so \1 would become the character with code 1. So in
double quotes, the \1 needs to be \1 so: