regex - JavaScript regular expression "Nothing to repeat" error

Question

I have this error while trying to get the tokens the code to make the lexical analysis for the Minic langauge !

document.writeln("1,2 3=()9$86,7".split(/,| |=|$|/));

document.writeln("<br>");
document.writeln("int sum ( int x , int y ) { int z = x + y ; }");
document.writeln("<br>");
document.writeln("int sum ( int x , int y ) { int z = x + y ; }".split(/,|*|-|+|=|<|>|!|&|,|/));

I get error on the debugger for the last line Uncaught SyntaxError: Invalid regular expression: Nothing to repeat !!

Answer 1

You need to escape special characters:

/,|*|-|+|=|<|>|!|&|,|/

See what special characters need to be escaped: