dphiffer

<p>Strict Permalinks does two things:</p>
<ol>
<li>Restricts the <code>post_name</code> portion of the permalink to alphanumerics and hyphens</li>
<li>Disables permalink editing once a post is published</li>
</ol>
<p>Like me, you may have been under the impression that post slugs are already restricted to alphanumerics and hyphens. In the current WordPress 2.8.5, a title that includes certain kinds of punctuation (e.g., “smartquotes”) will result in URL-encoded characters in the <code>post_name</code> field. Many browsers handle this oddity seamlessly, however this may cause difficulties when integrating with systems expecting a more limited URL syntax.</p>
<h3>Upgrade</h3>
<ol>
<li>Use the plugin updater in WordPress or…</li>
<li>Delete the previous <code>strict-permalinks</code> folder from the <code>/wp-content/plugins/</code> directory</li>
<li>Upload the new <code>strict-permalinks</code> folder to the <code>/wp-content/plugins/</code> directory</li>
</ol>
<h3>Usage</h3>
<ol>
<li>In all cases the <code>post_title</code> to <code>post_name</code> conversion (i.e., the <code>sanitize_title</code> filter) will be limited to a-z, 0-9 and hyphens (-).</li>
<li>If a post is not yet published, the permalink can be edited as usual.</li>
<li>Once a post is published, the permalink editing interface is disabled.</li>
</ol>


Strict Permalinks

Restricts permalink syntax and disables permalink editing after a post is published.

Dimitris Mavroudis

<p>AutoConvert Greeklish Permalinks converts greek characters to latin in all permalinks. The plugin makes sure that every new permalink is in greeklish and offers the option to convert all the old links with greek characters to latin.</p>
<h3>Features</h3>
<ul>
<li>Convert automaticly the permalink of every new post and term.</li>
<li>Convert all your older posts and terms with a click of a button.</li>
<li>Choose how dipthongs are converted. </li>
<li>Developed to be friendly to developers with WP-CLI support and filter to modify the converion.</li>
</ul>


AutoConvert Greeklish Permalinks

Thank you for sharing this plugin. It works very nice both using the classic WordPress Dashboard as well with the Rest API.

Very good plugin.

I was ready to "reinvent the wheel" but just then i found this plugin

Does exactly what it says

Convert Greek characters to Latin on all your site's permalinks instantly.

Strict Permalinks vs AutoConvert Greeklish Permalinks