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<?php $string = null; var_dump(preg_replace((int)'/\s+/', '', $string));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /in/SGcKp on line 3 Warning: preg_replace(): Delimiter must not be alphanumeric, backslash, or NUL in /in/SGcKp on line 3 NULL

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