匹配字符串开头的首字母后跟一个有效的字母字符串 - 正则表达式

Question

我想匹配一个以（先生|夫人|女士| Dr. |呃）跟随任何字符串[a- zA-Z]，但它也通过了“Er.Dr.”。

让我知道我在做什么在这里正则表达式的错误。

var input = [ 
    {str: "Mr.X", expectedValue: true}, 
    {str: "Mrs.Y", expectedValue: true}, 
    {str: "Dr#Joseph", expectedValue: false}, 
    {str: "Er .Abc", expectedValue: false}, 
    {str: "Er.Dr.", expectedValue: false}, 
    {str: "Er.Abc", expectedValue: true} 
]; 

var re = /^(Mr|Mrs|Ms|Dr|Er)\.+[A-Za-z]/; 

input.forEach(x => { 
    var answer; 
    var matchStr; 
    answer = re.test(x.str); 
    matchStr = x.expectedValue === answer ? "MATCH" : "NO MATCH"; 
    console.log("------------------------------------------------------------------------------"); 
    console.log(`"${x.str}" | Expected Output: ${x.expectedValue} | My Output: ${answer} | ${matchStr}`); 
    console.log("------------------------------------------------------------------------------"); 
}) 

输出 -

Answer 1

你可以改变正则表达式一点，从

/^(Mr|Mrs|Ms|Dr|Er)\.+[A-Za-z]/ 

到

/^(Mr|Mrs|Ms|Dr|Er)\.[A-Za-z]+$/ 

没有多个.并检查字母直到字符串结束。

var input = [ 
 
    {str: "Mr.X", expectedValue: true}, 
 
    {str: "Mrs.Y", expectedValue: true}, 
 
    {str: "Dr#Joseph", expectedValue: false}, 
 
    {str: "Er .Abc", expectedValue: false}, 
 
    {str: "Er.Dr.", expectedValue: false}, 
 
    {str: "Er.Abc", expectedValue: true} 
 
]; 
 

 
var re = /^(Mr|Mrs|Ms|Dr|Er)\.[A-Za-z]+$/; 
 

 
input.forEach(x => { 
 
    var answer; 
 
    var matchStr; 
 
    answer = re.test(x.str); 
 
    matchStr = x.expectedValue === answer ? "MATCH" : "NO MATCH"; 
 
    console.log(`"${x.str}" | Expected Output: ${x.expectedValue} | My Output: ${answer} | ${matchStr}`); 
 
})