指示說要從字符串中刪除所有句點，逗號和連字符

Question

但是，我仍然在代碼中的特定點處提供空字符串。

下面是代碼：

beg=document.twocities.begins.value; 
len_beg=beg.length; 

var beg = beg.replace(/.,-/g," "); 

1.

var beg_array=beg.split(" "); 
ans1.innerHTML=beg_array.length; 

2.

ans2.innerHTML=beg_array[0]+" "+beg_array[116]; 

3.

ans3.innerHTML=beg_array; 

4.

beg_upper=beg.toUpperCase(); 
ans4.innerHTML=beg_upper; 

這裏是輸出：

1. 116 
2. It undefined 
3. It,was,the,best,of,times,,it,was,the,worst,of,times, it,was,the,age,of,wisdom,,it,was,the,age,of,foolishness, it,was,the,epoch,of,belief,,it,was,the,epoch,of,incredulity,, it,was,the,season,of,Light,,it,was,the,season,of,Darkness,, it,was,the,spring,of,hope,,it,was,the,winter,of,despair,, we,had,everything,before,us,,we,had,nothing,before,us, we,were,all,going,direct,to,Heaven,,we,were,all,going,direct,the,other,way,-- in,short,,the,period,was,so,far,like,the,present,period,, that,some,of,its,noisiest,authorities,insisted,on,its,being,received,, for,good,or,for,evil,,in,the,superlative,degree,of,comparison,only. 
4. IT WAS THE BEST OF TIMES, IT WAS THE WORST OF TIMES, IT WAS THE AGE OF WISDOM, IT WAS THE AGE OF FOOLISHNESS, IT WAS THE EPOCH OF BELIEF, IT WAS THE EPOCH OF INCREDULITY, IT WAS THE SEASON OF LIGHT, IT WAS THE SEASON OF DARKNESS, IT WAS THE SPRING OF HOPE, IT WAS THE WINTER OF DESPAIR, WE HAD EVERYTHING BEFORE US, WE HAD NOTHING BEFORE US, WE WERE ALL GOING DIRECT TO HEAVEN, WE WERE ALL GOING DIRECT THE OTHER WAY -- IN SHORT, THE PERIOD WAS SO FAR LIKE THE PRESENT PERIOD, THAT SOME OF ITS NOISIEST AUTHORITIES INSISTED ON ITS BEING RECEIVED, FOR GOOD OR FOR EVIL, IN THE SUPERLATIVE DEGREE OF COMPARISON ONLY. 

Answer 1

移除所有,.-（使用[]列表）

var string = "Th.is,, ,,is .so---me- -ni-ce. ..str,in.g"; 
 
var fixed = string.replace(/[,.-]/g, ''); 
 
alert(fixed); // "This is some nice string"

移除所有,.-（使用|的替代品。在這裏，你需要\逃避.令牌）

var string = "Th.is,, ,,is .so---me- -ni-ce. ..str,in.g"; 
 
var fixed = string.replace(/,|\.|-/g, ''); 
 
alert(fixed); // "This is some nice string"

刪除任何東西，但A-Z A-Z charaters和\s空間

var string = "Th.is,, ,,is .so---me- -ni-ce. ..str,in.g"; 
 
var fixed = string.replace(/[^a-zA-Z\s]/g, ''); 
 
alert(fixed); // "This is some nice string"

刪除任何東西，但A- Z（i不區分大小寫標誌）charaters和\s空間

var string = "Th.is,, ,,is .so---me- -ni-ce. ..str,in.g"; 
 
var fixed = string.replace(/[^a-z\s]/ig, ''); 
 
alert(fixed); // "This is some nice string"