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请教如何去掉字符串第一个逗号

WBOY
WBOYOriginal
2016-06-13 12:47:121165browse

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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