请问怎么去掉字符串第一个逗号
,abcdefg,sfsdfsdfsd,sfddfs
,,abcdefg,sfsdfsdfsd,sfddfs
我想把左边的逗号去掉,至于是一个或者两个是不确定的,不过最多两个,请问怎么去掉左边的逗号。
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