Remove special characters" but leave all letters (multi-language)

Hello,

I would like to remove all "special characters" but leave all letters.

The problem is that I need to support European languages, many which use letters beyond the 26 that English uses.



These should be REMOVED

< > ( ) ! # $ % ^ & = + ~ ` * " ' ¡ ¤ ¢ £ ¥ ¦ § ¨ © ª «  ¬ ­ ® ™ ¯ ° ± ² ³ ´ µ ¶ · ¸ ¹ º » ¼ ½ ¾ ¿ × ÷

But these should NOT be removed

à á â ã ä å é ê ë ì í î ï ñ ò ó ô õ ö ù ú û ü ý ÿ


There are many more that SHOULD be removed and many more that SHOULD NOT be removed, but the idea is if it can be used any any European language as part of a word I want to keep it.  If not, I want to get rid of it.

Any ideas?

Thanks!

LVL 16
hankknightAsked:
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Serena HsiMarketing ConsultantCommented:
Well, depending on what software you're using to view/edit the text, all the ASCII characters have a code assigned to them.

This page has a list of both the standard ASCII list and extended ASCII characters.
http://office.microsoft.com/en-us/help/HA011331361033.aspx
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BasilisciCommented:
In Java this is easy with java.lang.Character.isLetter()

with Javascript, it is a bit trickier.

var newstr = "";
// loop each character
for (var i = 0; i < str.length; i++) {
  // get unicode code for character
  var c = str.charCodeAt(i);
 
  // here some code to block unicode ranges, this is just an example
  if (c < 30) {
    continue;
  }
  newstr += str.charAt(i);
}

You should then find some unicode reference to look up the ranges for valid letters. They are usually in continuous blocks, so that should not be too hard.

You could also try some Regular Expression syntax, but I'm not sure what.
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FreakTrapCommented:
<?php

$string = "Hello%$#@ world";
str_replace(array("$", "%", "@", "#"), "", $string);
echo $string;

//Should echo 'Hello world'

?>
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BasilisciCommented:
If you choose the "heavy, but bulletproof" unicode approach, you can use the official unicode reference to find the ranges for real letters (http://www.unicode.org/Public/UNIDATA/UnicodeData.txt).

The third colum in the CSV file tells the type, if it is "Lu" (uppercase letter) or "Li" (lowercase letter), you are safe. More info at http://www.unicode.org/Public/UNIDATA/UCD.html#General_Category_Values

This is propably the approach that is used in Java's isLetter implementation.
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hankknightAuthor Commented:
Thanks
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