> For the complete documentation index, see [llms.txt](https://knowledgebase.ajaxsearchpro.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledgebase.ajaxsearchpro.com/miscellaneous/other/replace-or-remove-characters-from-search-phrase.md).

# Replace or remove characters from search phrase

By default the plugin allows searching any character without restriction. If you however need to replace (or remove) certain special characters, use the code below.

[What is this, and where do I put this custom code?](/safe-coding-guideline.md)

```php
add_filter('asp_query_args', 'asp_replace_characters', 10, 1);
function asp_replace_characters( $args ) {
  $characters = "',._-?!"; // Type characters one after another
  $replace_with = ' ';     // Replace them with this (space by default)

  $args['s'] = str_replace(str_split($characters), $replace_with, $args['s']);      

  return $args; 
}
```

Type the characters into the $characters variable, one after another. By default it replaces it with a space character. In case you want to remove those characters, change the

```
$replace_with = ' ';
```

with:

```
$replace_with = '';
```


---

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## Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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