Pattern Matches using following Sibling | Java Selenium

//This method will store all the following text into List and verify each in saparatly 

public String getTexFollowingSibling() {

String element = "";

List<WebElements> allElement = driver.findElements("Xpath/../following-sibling::td[1]");

for(WebElement ele : allElement) {

element+= ele.getText();

}

return element;

}

String textByfollowingSibling = getTexFollowingSibling();

Assert.assertTrue(Pattern.matches("(High)*(Medium)*(Low)*", textByfollowingSibling);