c# - Regex Pattern for filename like XX_XXXX_XXXX_DDMMYYYY -


i retrieving set of files directory. file names in pattern xx_xxxx_xxxx_ddmmyyyy. xx stands country prefix. valid prefixes in,id,sg,my. next set of xxxx ccms fixed. next set of xxxx vary. have below code optimise.

    string[] filepath = directory.getfiles(configurationmanager.appsettings["inputfiles"]);             foreach (string inputfilepath in filepath)             {                 try                 {                     if ((inputfilepath.toupper().contains("hk_ccms_cardo_") || (inputfilepath.toupper().contains("id_ccms_cardo_")) || (inputfilepath.toupper().contains("in_ccms_cardo_")) ||                          (inputfilepath.toupper().contains("my_ccms_cardo_")) || (inputfilepath.toupper().contains("ph_ccms_cardo_")) || (inputfilepath.toupper().contains("sg_ccms_cardo_")) ||                          (inputfilepath.toupper().contains("th_ccms_cardo_")) || (inputfilepath.toupper().contains("tw_ccms_cardo_"))))                     {     //     }     }

i want replace each inputfilepath.toupper().contains("hk_ccms_cardo_") pattern search fit pattern have given earlier. please help. thanks

not using regular expression, remove redundancy:

var prefixes = new string[]{   "hk_ccms_cardo_", "id_ccms_cardo_", "in_ccms_cardo_",   "my_ccms_cardo_", "ph_ccms_cardo_", "sg_ccms_cardo_" }; foreach(string inputfilepath in filepath) {   try   {     if(prefixes.any((string prefix) => inputfilepath.toupper().startswith(prefix)))     {       // ...     }   } }

if use regex, generate regex string using string.join('|') concatenate pieces , add date part on end, since you're not trying match format number of known prefixes kind of think above clearer.


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