javascript - How can I make sure that when my ellipsis gets added lastindexof space it also checks its alphabet before it gets added and not special chars -

the code looks this:

 function trimlength(text, maxlength) {         text = $.trim(text);          if (text.length > maxlength) {             text = text.substring(0, maxlength - ellipsis.length)             return text.substring(0, text.lastindexof(" ")) + ellipsis;         }         else             return text;     } 

the problem have following thing:

hello world , an...  curse of gaming backlog –... 

i want make sure instead does:

hello world and...  curse of gaming backlog... 

i guess need make sure there alphabet char (a,b,c,d etc..) , no special characters.

any kind of appreciated

you might want start this:

function cutoff(str, maxlen) {     // no need cut off     if(str.length <= maxlen) {         return str;     }      // find cutoff point     var oldpos = pos = 0;     while(pos!==-1 && pos <= maxlen) {         oldpos = pos;         pos = str.indexof(" ",pos) + 1;     }     if (pos>maxlen) { pos = oldpos; }     // return cut off string ellipsis     return str.substring(0,pos) + "..."; } 

which @ least gives cutoffs based on words, rather letters. if need additional filtering, can add it, give cutoff such "the curse of gaming backlog – ..." doesn't wrong, honestly.