appendtrailingcharifabsentasciibit_lengthCHAR_LENGTHconcatconcat_wsends_withfindinsethexinstrlcaseleftlengthlocatelowerlpadltrimmoney_formatnulloremptyrepeatreplaceREVERSErightrpadsplit_partstarts_withstrleftstrrightsubstringunhex模糊匹配正则匹配