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<?php $pattern = "/b[0-9]{4}(*SKIP)(*F)|[^a-z_]/"; $str = "b7001_cp_parc_venc_fluxo_1234"; echo preg_replace($pattern, "", $str);
Output for git.master, git.master_jit, rfc.property-hooks
b7001_cp_parc_venc_fluxo_

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