匹配给定字符串中所有不包含小写字母或仅包含大写字母的单词

Question

I would like to retrieve only those words from given string which are not all CAPS and all Lower or only first letter is upper

For example in below sentence all should be extracted except first 4 words:

a abcd Hello AJP

string str = "a abcd Hello AJP lbl_Description MHz AssignExistingUserOptionText _BTHAudClassDrv_KEYWORD A_dd actelisMetaLOOP AudEngineStream_BeginStreamSwitch_Enter AudEngineStream_BeginEOS Bo_th btnChange C_hange CDs CHECK_AND_CHANGE_ACCESS_MASKS checkBox1 CIMObjectPath ciscoISLvlan comboEmailAccounts D_elete CSVFS_ReFS D_HCP DADOrNUDReply DECnet IPv4 kJ kPa LAlt  mL N_o tabPage11 uAPSD VLANs YCbCr"

Answer 1

You can do it using Split method and LINQ:

var result = str.Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries)
                .Where(x => !x.All(char.IsUpper) &&
                            !x.All(char.IsLower) &&
                            !(char.IsUpper(x[0]) &&
                              x.Skip(1).All(char.IsLower)))
                .ToArray();