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<?php $string = "Hello {replace this curley} {{but not this one}} {{{and not this one}}}"; $formatted = preg_replace('/^(?!\{{2,})(?:[^\{]*)(\{{1})(?:[^\{\}]*)(\}{1})$/',"",$string); var_dump($formatted);
Output for git.master, git.master_jit, rfc.property-hooks
string(71) "Hello {replace this curley} {{but not this one}} {{{and not this one}}}"

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