appendtrailingcharifabsentasciibit_lengthCHAR_LENGTHconcatconcat_wsends_withfindinsetgetjsondoublegetjsonintgetjsonstringgroup_concatinstrlcaseleftlengthlocatelowerlpadltrimmoney_formatnulloremptyrepeatreplaceREVERSErightrpadsplit_partstarts_withstrleftstrright模糊匹配正则匹配