PHP/String/String Replace

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Quantifier Syntaxes

   <source lang="html4strict">

Quantifier Min Max Range {m} m m Exactly m times {m, x} m x At least m times, no more than x {m,} m Infinite At least m times or more

  • 0 Infinite Zero or more times

? 0 1 Zero or one times + 1 Infinite One or more times 

      </source>


Replace the tag content without getting rid of any attributes

   <source lang="html4strict">

<?php 

    $string = "<a href=\"http://www.wbex.ru/\">wbex.ru</a>
" ;
  
    $pattern = "/<a(.*?)>.*?<\/a>/i";
    $replacement = "<a\1>Click!</a>";
  
    $string = preg_replace($pattern, $replacement, $string);
    print($string);

?> 

      </source>


Replacing a Pattern with a Found String

   <source lang="html4strict">

<html> <head> <title>preg_replace</title> </head> <body> <?php 

    $string = "<a href=\"http://www.wbex.ru/\">wbex</a>
";
  
    $pattern = "/<a[ .]*?(href *= *".*?").*?>(.*?)<\/a>/i";
    $replacement = "\2: <a \1>\1</a>";
  
    $string = preg_replace($pattern, $replacement, $string);
    print($string);

?> </body> </html> 

      </source>


String replace: index and value

   <source lang="html4strict">

<? print(substr_replace("ABCDEFG", "-", 2, 3)); ?> 

      </source>


String replace with Regular Expressions

   <source lang="html4strict">

<? $old_string = "I really love programming in ASP!"; $new_string = ereg_replace("ASP", "PHP", $old_string); echo "$new_string"; ?> 

      </source>


str_replace: @ (at)

   <source lang="html4strict">

<?php 

  $author = "j@wbex.ru";
  $author = str_replace("@","(at)",$author);
  echo "Contact the author of this article at $author.";

?> 


      </source>


What happens when multiple instances of the search string overlap?

   <source lang="html4strict">

<? $tricky_string = "ABA is part of ABABA"; $maybe_tricked = str_replace("ABA", "DEF", $tricky_string); print("Substitution result is "$maybe_tricked"
"); ?> 

      </source>
Источник — «http://www.wbex.ru/index.php?title=PHP/String/String_Replace&oldid=1347»