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<?php function camelCaseToUnderscore($input) { return strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $input)); } echo camelCaseToUnderscore('caseStudy'), "\n"; echo camelCaseToUnderscore('News'), "\n"; echo camelCaseToUnderscore('BuyACar'), "\n"; echo camelCaseToUnderscore('XML'), "\n"; echo camelCaseToUnderscore('SimpleXML'), "\n";
Output for git.master, git.master_jit, rfc.property-hooks
case_study news buy_a_car x_m_l simple_x_m_l

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