PHP preg replace special characters

Question

I am wanting to replace all non letter and number characters i e    amp     etc with an underscore     and replace all    single quotes  with   blank  so no underscore    So  There wouldn t be any   ignore the double quotes  would become  There wouldnt be any    I am useless at reg expressions hence the post   Cheers

User · Answer

If you by writing  non letters and numbers  exclude more than  A-Za-z0-9   ie  considering letters like        to be letters to  and want to be able to accurately handle UTF-8 strings  p L  and  p N  will be of aid     p N  will match any  Number   p L  will match any  Letter Character   which includes   Lower case letter Modifier letter Other letter Title case letter Upper case letter    Documentation PHP  Unicode Character Properties     data    Th  re wouldn t b     ny     new data   str replace             data    new data   preg replace       p L  p N   u         new data    var dump      new data      output  string 23   Th  re wouldnt b     ny

User · Answer

newstr   preg replace     a-zA-Z0-9             There wouldn t be any     newstr   str replace           newstr     I put them on two separate lines to make the code a little more clear   Note  If you re looking for Unicode support  see Filip s answer below  It will match all characters that register as letters in addition to A-z

User · Answer

do this in two steps    replace not letter characters with this regex        amp       replace quotes with this regex            and use preg replace    stringWithoutNonLetterCharacters   preg replace        amp                yourString    stringWithQuotesReplacedWithSpaces   preg replace                   stringWithoutNonLetterCharacters

[php] PHP preg_replace special characters

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