Actionscript 3 replacing string - string

Question

I am trying to replace a substring in a string. My code below replaces all occurrences of substring. E.g. When clicked on in it replaces both in. But I like to replace only clicked one. How can we do this?
The books are in the table in my room.
function correct(e:TextEvent):void{
str =String(e.currentTarget.htmlText);
if(e.text==replacements[e.currentTarget.name]){
e.currentTarget.htmlText =strReplace(str, e.text, corrections[e.currentTarget.name]);
}
}
function strReplace(str:String, search:String, replace:String):String {
return str.split(search).join(replace);
}

Answer 1

You can use TextField.getCharIndexAtPoint(x:Number, y:Number):int to get the (0-based) index of the char in a particular coordinate.
You obviously need to use your clicked point as (x, y).
You can use localX and localY from TextField.click event.
See here for more: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/text/TextField.html#getCharIndexAtPoint%28%29
At this point you need to search the string to replace in the neighborhood of the clicked char.
For example, something like this:
stringToReplace = "in";
len = stringToReplace.Length;
neighborhood = TextField.substring(clickedCharIndex-len, clickedCharIndex+len);
if (neighborhood.indexOf(stringToReplace)) {
neighborhood = neighborhood.replace(stringToReplace, replacement);
TextField.text = TextField.text(0, clickedCharIndex-len) + neighborhood +
TextField.text(clickedCharIndex+len);
}