Re: case and accent - insensitive regular expression?

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I dont think using all these regular expressions is a very efficient way to
do so. As i previously pointed out there are many users who had a similar
problem, which can be viewed at:

http://it.php.net/manual/en/function.strtr.php

One of my favourites is what derernst at gmx dot ch used.

derernst at gmx dot ch
wrote on 20-Sep-2005 07:29
This works for me to remove accents for some characters of Latin-1, Latin-2
and Turkish in a UTF-8 environment, where the htmlentities-based solutions
fail:

<?php
>
function remove_accents($string, $german=false) {

  // Single letters

  $single_fr = explode(" ", "� � � � � � &#260; &#258; � &#262; &#268;
&#270; &#272; � � � � � &#280; &#282; &#286; � � � � &#304; &#321; &#317;
&#313; � &#323; &#327; � � � � � � &#336; &#340; &#344; � &#346; &#350;
&#356; &#354; � � � � &#366; &#368; � � &#377; &#379; � � � � � � &#261;
&#259; � &#263; &#269; &#271; &#273; � � � � &#281; &#283; &#287; � � � �
&#305; &#322; &#318; &#314; � &#324; &#328; � � � � � � � &#337; &#341;
&#345; &#347; � &#351; &#357; &#355; � � � � &#367; &#369; � � � &#378;
&#380;");

  $single_to = explode(" ", "A A A A A A A A C C C D D D E E E E E E G I I I
I I L L L N N N O O O O O O O R R S S S T T U U U U U U Y Z Z Z a a a a a a
a a c c c d d e e e e e e g i i i i i l l l n n n o o o o o o o o r r s s s
t t u u u u u u y y z z z");

  $single = array();

  for ($i=0; $i<count($single_fr); $i++) {

  $single[$single_fr[$i]] = $single_to[$i];

  }

  // Ligatures

  $ligatures = array("�"=>"Ae", "�"=>"ae", "�"=>"Oe", "�"=>"oe", "�"=>"ss");

  // German umlauts

  $umlauts = array("�"=>"Ae", "�"=>"ae", "�"=>"Oe", "�"=>"oe", "�"=>"Ue",
"�"=>"ue");

  // Replace

  $replacements = array_merge($single, $ligatures);

  if ($german) $replacements = array_merge($replacements, $umlauts);

  $string = strtr($string, $replacements);

  return $string;

}

?>

I would change this function a bit ...

<?php
//echo rawurlencode("áàéèíìóòúùÁÀÉÈÍÌÓÒÚÙ"); // RFC 1738 codes; NOTE: One
might use UTF-8 as this documents encoding
function remove_accents($string) {
 $string = rawurlencode($string);
 $replacements = array(
 '%C3%A1' => 'a',
 '%C3%A0' => 'a',
 '%C3%A9' => 'e',
 '%C3%A8' => 'e',
 '%C3%AD' => 'i',
 '%C3%AC' => 'i',
 '%C3%B3' => 'o',
 '%C3%B2' => 'o',
 '%C3%BA' => 'u',
 '%C3%B9' => 'u',
 '%C3%81' => 'A',
 '%C3%80' => 'A',
 '%C3%89' => 'E',
 '%C3%88' => 'E',
 '%C3%8D' => 'I',
 '%C3%8C' => 'I',
 '%C3%93' => 'O',
 '%C3%92' => 'O',
 '%C3%9A' => 'U',
 '%C3%99' => 'U'
 );
 return strtr($string, $replacements);
}
//echo remove_accents("CÀfé"); // I know it's not spelled right
echo remove_accents("áàéèíìóòúùÁÀÉÈÍÌÓÒÚÙ"); //OUTPUT (again: i used UTF-8
for document): aaeeiioouuAAEEIIOOUU
?>

Ciao

Yeti
On Mon, Jul 14, 2008 at 8:20 PM, Andrew Ballard <aballard@xxxxxxxxx> wrote:

> On Mon, Jul 14, 2008 at 1:35 PM, Giulio Mastrosanti
> <giulio@xxxxxxxxxxxxx> wrote:
> >>
> >
> > Brilliant !!!
> >
> > so you replace every occurence of every accent variation with all the
> accent
> > variations...
> >
> > OK, that's it!
> >
> > only some more doubts ( regex are still an headhache for me... )
> >
> > preg_replace('/[iìíîïĩīĭįı]/iu',...  -- what's the meaning of iu after
> the
> > match string?
>
> This page explains them both.
> http://us.php.net/manual/en/reference.pcre.pattern.modifiers.php
>
> > preg_replace('/[aàáâãäåǻāăą](?!e)/iu',... whats (?!e)  for? -- every
> > occurence of aàáâãäåǻāăą NOT followed by e?
>
> Yes. It matches any character based on the latin 'a' that is not
> followed by an 'e'. It keeps the pattern from matching the 'a' when it
> immediately precedes an 'e' for the character 'ae' for words like
> these:
>
> http://en.wikipedia.org/wiki/List_of_words_that_may_be_spelled_with_a_ligature
> (However, that may cause problems with words that have other variants
> of 'ae' in them. I'll leave that to you to resolve.)
> http://us.php.net/manual/en/regexp.reference.php
>
>
>
> > Many thanks again for your effort,
> >
> > I'm definitely on the good way
> >
> >      Giulio
> >
> >
> >>
> >> I was intrigued by your example, so I played around with it some more
> >> this morning. My own quick web search yielded a lot of results for
> >> highlighting search terms, but none that I found did what you're
> >> after. (I admit I didn't look very deep.) I was up to something like
> >> this before your reply came in. It's still by no means complete. It
> >> even handles simple English plurals (words ending in 's' or 'es'), but
> >> not variations that require changing the word base (like 'daisy' to
> >> 'daisies').
> >>
> >> <?php
> >> function highlight_search_terms($phrase, $string) {
> >>   $non_letter_chars = '/[^\pL]/iu';
> >>   $words = preg_split($non_letter_chars, $phrase);
> >>
> >>   $search_words = array();
> >>   foreach ($words as $word) {
> >>       if (strlen($word) > 2 && !preg_match($non_letter_chars, $word)) {
> >>           $search_words[] = $word;
> >>       }
> >>   }
> >>
> >>   $search_words = array_unique($search_words);
> >>
> >>   foreach ($search_words as $word) {
> >>       $search = preg_quote($word);
> >>
> >>       /* repeat for each possible accented character */
> >>       $search = preg_replace('/(ae|æ|ǽ)/iu', '(ae|æ|ǽ)', $search);
> >>       $search = preg_replace('/(oe|œ)/iu', '(oe|œ)', $search);
> >>       $search = preg_replace('/[aàáâãäåǻāăą](?!e)/iu',
> >> '[aàáâãäåǻāăą]', $search);
> >>       $search = preg_replace('/[cçćĉċč]/iu', '[cçćĉċč]', $search);
> >>       $search = preg_replace('/[dďđ]/iu', '[dďđ]', $search);
> >>       $search = preg_replace('/(?<![ao])[eèéêëēĕėęě]/iu',
> >> '[eèéêëēĕėęě]', $search);
> >>       $search = preg_replace('/[gĝğġģ]/iu', '[gĝğġģ]', $search);
> >>       $search = preg_replace('/[hĥħ]/iu', '[hĥħ]', $search);
> >>       $search = preg_replace('/[iìíîïĩīĭįı]/iu', '[iìíîïĩīĭįı]',
> $search);
> >>       $search = preg_replace('/[jĵ]/iu', '[jĵ]', $search);
> >>       $search = preg_replace('/[kķĸ]/iu', '[kķĸ]', $search);
> >>       $search = preg_replace('/[lĺļľŀł]/iu', '[lĺļľŀł]', $search);
> >>       $search = preg_replace('/[nñńņňʼnŋ]/iu', '[nñńņňʼnŋ]', $search);
> >>       $search = preg_replace('/[oòóôõöōŏőǿơ](?!e)/iu',
> >> '[oòóôõöōŏőǿơ]', $search);
> >>       $search = preg_replace('/[rŕŗř]/iu', '[rŕŗř]', $search);
> >>       $search = preg_replace('/[sśŝşš]/iu', '[sśŝşš]', $search);
> >>       $search = preg_replace('/[tţťŧ]/iu', '[tţťŧ]', $search);
> >>       $search = preg_replace('/[uùúûüũūŭůűųǔǖǘǚǜ]/iu',
> >> '[uùúûüũūŭůűųǔǖǘǚǜ]', $search);
> >>       $search = preg_replace('/[wŵ]/iu', '[wŵ]', $search);
> >>       $search = preg_replace('/[yýÿŷ]/iu', '[yýÿŷ]', $search);
> >>       $search = preg_replace('/[zźżž]/iu', '[zźżž]', $search);
> >>
> >>
> >>       $string = preg_replace('/\b' . $search . '(e?s)?\b/iu', '<span
> >> class="keysearch">$0</span>', $string);
> >>   }
> >>
> >>   return $string;
> >>
> >> }
> >> ?>
> >>
> >> I still can't help feeling there must be some better way, though.
> >>
> >>>
> >>> well, i think I'm on the good way now, unfortunately I have some other
> >>> urgent work and can't try it immediately, but I'll let you know    :)
> >>>
> >>> thank you!
> >>>
> >>>   Giulio
> >>
> >>
> >> Andrew
> >>
> >>
> >
> >
>

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