Dangling meta character ' near index 0

1.replaceAll () Method error
Replace the * with the ReplaceAll () method for the string? + / | The following exception will be reported when the character is
Dangling meta character ' * ' near index 0

This is mainly because these symbols have a corresponding meaning in the regular expression.
Simply change it to [*] or//*

2.split () Method error
Use the Split () method on the string to intercept *? + / | The following exception will be reported when the character is
Dangling meta character '? ' near index 0?

+, *, |, and other symbols in the regular expression of the corresponding different meanings.
Generally only need to add [], or \ Can

int I=s.split ("[?]"). Length

Or

int i=s.split ("\?"). Length;i);