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I want to remove all non-alphanumeric and space characters from a string. So I do want spaces to remain. What do I put for a space in the below function within the [ ] brackets:
ereg_replace("[^A-Za-z0-9]", "", $title);
In other words, what symbol represents space, I know \n represents a new line, is there any such symbol for a single space.
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To remove all non-alphanumeric characters from a string, call the replace() method, passing it a regular expression that matches all non-alphanumeric characters as the first parameter and an empty string as the second. The replace method returns a new string with all matches replaced.
Using str_replace() Method: The str_replace() method is used to remove all the special characters from the given string str by replacing these characters with the white space (” “).
Alphanumeric characters by definition only comprise the letters A to Z and the digits 0 to 9. Spaces and underscores are usually considered punctuation characters, so no, they shouldn't be allowed.
Select the range that you need to remove non-alphanumeric characters from, and click Kutools > Text > Remove Characters. 2. Then a Delete Characters dialog box will appear, only check Non-alphanumeric option, and click the Ok button. Now all of the non-alphanumeric characters have been deleted from the text strings.
Just put a plain space into your character class:
[^A-Za-z0-9 ]
For other whitespace characters (tabulator, line breaks, etc.) use \s instead.
You should also be aware that the PHP’s POSIX ERE regular expression functions are deprecated and will be removed in PHP 6 in favor of the PCRE regular expression functions. So I recommend you to use preg_replace instead:
preg_replace("/[^A-Za-z0-9 ]/", "", $title)
If you want only a literal space, put one in. the group for 'whitespace characters' like tab and newlines is \s
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