I was surprised that the following is a valid Parameter Expansion. Notice there are unescaped double quotes within double quotes:

result="${var1#"$var2"}"

Can someone please parse this for me?

CodePudding user response：

There are double quotes nested in curly brackets which is OK.

But none of them is needed in this case.

result=${var1#$var2}

works the same even for values containing spaces and newlines.