How to remove non-alphanumeric characters

Question

I need to remove all characters from a string which aren t in a-z A-Z 0-9 set or are not spaces   Does anyone have a function to do this

User · Answer

Regular expression is your answer     str   preg replace     a-z d   i        str      The i stands for case insensitive     means  does not start with    d matches any digit   a-z matches all characters between a and z  Because of the i parameter you don t have to specify a-z and A-Z   After  d there is a space  so spaces are allowed in this regex

User · Answer

here s a really simple regex for that    W     and used as you need it  with a forward   slash delimiter    preg replace    W           string     Test it here with this great tool that explains what the regex is doing   http   www regexr com

User · Answer

I was looking for the answer too and my intention was to clean every non-alpha and there shouldn t have more than one space   So  I modified Alex s answer to this  and this is working for me preg replace     a-z  s    i         name   The regex above turned sy8ed sirajul7 islam to sy ed sirajul islam  Explanation  regex will check NOT ANY from a to z in case insensitive way or more than one white spaces  and it will be converted to a single space

User · Answer

If you need to support other languages  instead of the typical A-Z  you can use the following   preg replace      p L  p N             string         p L  p N    defines a negated  It will match a character that is not defined  character class of     p L   a letter from any language   p N   a numeric character in any script    a space character     greedily matches the character class between 1 and unlimited times    This will preserve letters and numbers from other languages and scripts as well as A-Z   preg replace      p L  p N             hello-world       helloworld preg replace      p L  p N             abc   123-               abc123       preg replace      p L  p N                         amp                    Note  This is a very old  but still relevant question  I am answering purely to provide supplementary information that may be useful to future visitors

User · Answer

Sounds like you almost knew what you wanted to do already  you basically defined it as a regex   preg replace     A-Za-z0-9           string

User · Answer

W           string   preg replace     W    u        string     It select all not A-Z  a-z  0-9 and delete it   See example here  https   regexr com 3h1rj

User · Answer

For unicode characters  it is    preg replace       alnum    space    u        string

User · Answer

preg replace    W          string    You can test it here   http   regexr com

User · Answer

You can split the string into characters and filter it    lt  php   function filter alphanum  string         characters   str split  string        alphaNumeric   array filter  characters  ctype alnum        return join  alphaNumeric       res   filter alphanum  a bc  123    print r  res      abc123    gt

[php] How to remove non-alphanumeric characters?

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