Regex Test, consistent fail on every other when matching - or !

regex_compile_test2.js

var raw_str_regex = "-([a-zA-Z0-9_]+)$";
var regex = new RegExp(raw_str_regex, "gm");

var lst = [
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not"
];
var check_okay = [];
console.log(regex);
var test_value = regex.test( lst[0] );
console.log("test:", test_value, lst[0]);

var test_value1 = regex.test( lst[1] );
console.log("test:", test_value1, regex.source, lst[1]);

if(test_value && test_value === test_value1) {
    console.log("Yey!", RegExp.lastMatch);
} else {
    console.log("FAILED!!!", RegExp.lastMatch)
}

console.log(regex);
for(var i=0; i<lst.length; i++) {
    //regex.test(""); fixes it??
    var test_value = regex.test( lst[i] );
    console.log(test_value, lst[i]);
    if(test_value === true) {
        check_okay.push(test_value);
    }
}

if(check_okay.length === lst.length) {
    console.log("okay");
} else {
    console.log("FAILED!!!!!!", RegExp.lastMatch);
}

regex_compiled_test2_no_global.js

// remove the global flag, no error


var raw_str_regex = "(-[a-zA-Z0-9_]+)$";
var regex = new RegExp(raw_str_regex, "m");

var lst = [
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not",
    "this is -not"
];
var check_okay = [];
console.log(regex);
var test_value = regex.test( lst[0] );
console.log("test:", test_value, lst[0]);

var test_value1 = regex.test( lst[1] );
console.log("test:", test_value1, regex.source, lst[1]);

if(test_value && test_value === test_value1) {
    console.log("Yey!", RegExp.lastMatch);
} else {
    console.log("FAILED!!!", RegExp.lastMatch)
}

console.log(regex);
for(var i=0; i<lst.length; i++) {
    //regex.test(""); fixes it??
    var test_value = regex.test( lst[i] );
    console.log(test_value, lst[i]);
    if(test_value === true) {
        check_okay.push(test_value);
    }
}

if(check_okay.length === lst.length) {
    console.log("okay", RegExp.lastMatch);
} else {
    console.log("FAILED!!!", RegExp.lastMatch);
}

results.txt output 1

$ node regex_compile_test2.js 
/-([a-zA-Z0-9_]+)$/gm
test: true this is -not
test: false -([a-zA-Z0-9_]+)$ this is -not
FAILED!!! -not
/-([a-zA-Z0-9_]+)$/gm
true 'this is -not'
false 'this is -not'
true 'this is -not'
false 'this is -not'
true 'this is -not'
false 'this is -not'
FAILED!!! "

results.txt output 2

$ node regex_compile_test2.js 
/(-[a-zA-Z0-9_]+)$/m
test: true this is -not
test: true (-[a-zA-Z0-9_]+)$ this is -not
Yey! -not
/(-[a-zA-Z0-9_]+)$/m
true 'this is -not'
true 'this is -not'
true 'this is -not'
true 'this is -not'
true 'this is -not'
true 'this is -not'
okay "