php - The str_ireplace and preg_replace attemt? -

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I am trying to replace a string with one original text. ( zinc -> gt; zn ) Example: 'zinc zinc zinc zinc 3! Zinc Zodiac # Zinc Zinc 9 Zinc @ zinc @ want to: 'zn zn zn zinc3! Zn zincmatic #zinc zinc9 zn @zinc @ stack_replayed attempts: $ text = 'zinc zinc zinc zinc 3 ! Zinc zodiac # zinc zinc 9 zinc @ zinc @ '; $ Word = 'zinc'; $ Attr = 'zn'; // cnt as str_ireplace will now be converted to zinc znmatic and # zinc #zn $ text = ''. $ Text will change in ''; $ Word = ''. $ Zinc ''; // will now try $ result = str_ireplace ($ word, $ attr, $ word); Echo trim ($ result);

Print zn zinc zn zinc3! Zinc zinc # zinc zinc 9 zn @ zinc @ .

Preg_replace attempts: P> 

  $ text = 'zinc zinc Zinc zinc 3! Zinc zodiac # zinc zinc 9 zinc '; $ Word = 'zinc'; $ Attr = 'zn'; $ Result = preg_replace ("/ \ b ($ word) \ b / i", $ attr, $ text); $ Return result;   
 Print  zn zn zn zinc3! Zn zincmatic #zn zinc9 zn @zn @  Almost what I want: It seems that in zinc,  zn  even if some special character near ! Zinc is  or  # zonx  but if any number is  zinc9  or  junkmic like text   
 I just have one I want to put the rule here so that  # zinc  is passed to  # zink ,  @ zinc @  to  @zink_  and ! Zinc  to ! Zn changes into   
 What to add is the exception of special characters if zinc is near one of them (i.e.:  #zinc ,  Zinc # < / Code>,  zinc@ ,  @ zanx )  
 I want to be an executable, the letter is  # ,  and ,  @   
 Thanks!  
  
 
 
 You can define such exceptions with negative  \ b  Behave like and can actually be used in conjunction.  
 In your case you want  (? & Lt;! [# & Amp; @])  to check the previous character, and  (?! [ # & Amp; @]) Click .  
  = preg_replace ("/ (? & Lt;?! [# & Amp; @]!) \ B ($ word) \ b ([# & amp; @]) / I ", $ Attr, $ text);

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