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var parts = str.split("\\"); // Splits on a single backslash
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str = "active - error - oakp-ms-001 Volume Usage-E:\\ PercentUsed E:\\";
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str = "active - error - oakp-ms-001 Volume Usage-E:\ PercentUsed E:\"
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var str = "active - error - oakp-ms-001 Volume Usage-E:\\ PercentUsed E:\\";
var match = str.match(/error - (.*?) ?Volume/);
if (match) {
console.log(match[1]); // oakp-ms-001
}