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<?php $strings = array( 'this is a string', 'this is $ a string', 'this is 12 string', 'this is $12.99 string', ); foreach ($strings as $string) { var_dump(strtolower(preg_replace('#[\s+]#', '-', preg_replace('#[^a-z0-9\-\s]#', '', $string)))); }
Output for git.master, git.master_jit, rfc.property-hooks
string(16) "this-is-a-string" string(17) "this-is--a-string" string(17) "this-is-12-string" string(19) "this-is-1299-string"

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