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Is it possible to do something to WP so that I'm able to use the e-mail address as username?

I do not want to download a plugin for this.

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I'm not sure if the WP's user registration page allows it, but the wp_insert_user_() function certainly does... I did this for a newsletter registration system, where each subscriber has the email assigned as name –  onetrickpony Nov 10 '11 at 14:04
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2 Answers

You can easily do this, all you have to do is create a user registration page and have the email address field fill both the username and email args to use for the wp_insert_user() function.

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Any chance of WP misbehaving when doing this? –  Steven Nov 10 '11 at 17:17
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WordPress uses the following function when creating users:

sanitize_user()

Sanitize username stripping out unsafe characters.

If $strict is true, only alphanumeric characters plus these: _, space, ., -, *, and @ are returned.

Removes tags, octets, entities, and if strict is enabled, will remove all non-ASCII characters. After sanitizing, it passes the username, raw username (the username in the parameter), and the strict parameter as parameters for the filter.

Short answer: Not without a plugin.

Source: http://codex.wordpress.org/Function_Reference/sanitize_user

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can't I create my own username sanitazion in functions.php that overrides the one WP is using by deafult? –  Steven Nov 11 '11 at 8:24
    
You're going to do it within a theme or edit the default functions.php? –  Sterling Hamilton Nov 11 '11 at 18:39
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