100 String manipulation examples

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Category Example Sample Input Expected Output
Basic st.ToUpper hello HELLO
Basic st.ToLower HELLO hello
Basic st.Trim text text
Basic st.TrimStart text text
Basic st.TrimEnd text text
Basic st.Length text 4
Basic String.IsNullOrEmpty(st) True
Basic String.IsNullOrWhiteSpace(st) True
Basic String.Concat(str1, str2) Ui,Path UiPath
Basic String.Join(“,”, arrString) {‘A’,‘B’,‘C’} A,B,C
Substring st.Substring(0,5) Invoice123 Invoi
Substring st.Substring(st.Length - 3) Account123 123
Substring st(0) ABC A
Substring st.Last Test t
Substring st.IndexOf(“abc”) xyzabc123 3
Substring st.LastIndexOf(“x”) index x match x 14
Substring st.Split("-"c)(0) 123-456 123
Substring st.Remove(0,3) ABCDEF DEF
Substring st.Substring(st.IndexOf(“(”)+1, st.IndexOf(“)”) - st.IndexOf(“(”) -1) Item(ID:12345) 12345
Substring Regex.Match(st, “\d{6}”).Value OTP: 123456 123456

Example:

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Category Example Sample Input Expected Output
Replace st.Replace(“old”,“new”) old text new text
Replace Regex.Replace(st,“\s+”," ") a b c a b c
Replace Regex.Replace(st,“[^A-Za-z0-9]”, “”) T!e@x#t$ Text
Replace st.Replace(Environment.NewLine," ") Line1
Line2 Line1 Line2
Replace st.Replace(vbTab, " ") Name Value Name Value
Replace st.Replace(“,”, “”).Replace(“.”, “”) 1,234.56 123456
Replace st.Remove(st.Length - 1) Hello! Hello
Replace st.TrimStart("0"c) 000123 123
Replace Regex.Replace(st,“[^\d]”,“”) AB123CD 123
Replace st.Replace(" “,”").ToUpper Ui Path UiPath
Search st.Contains(“abc”) 123abc456 True
Search st.StartsWith(“2025”) 2025-Q1 True
Search st.EndsWith(“.com”) example.com True
Search st.Equals(“ExactText”) ExactText True
Search st.ToLower.Contains(“admin”) HelloAdmin True
Search Regex.IsMatch(st, “^\d+$”) 12345 True
Search Regex.Match(st,“[A-Z]{3}”).Success ABC123 True
Search st.Any(Function(c) Char.IsDigit(c)) abc9xyz True
Search st.All(Function(c) Char.IsLetterOrDigit(c)) Test123 True
Search Not Regex.IsMatch(st,“[^\w\s]”) Safe_String 123 True

Example:

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Category Example Sample Input Expected Output
Format st.PadLeft(10,"0"c) 123 0000000123
Format st.PadRight(10,"_"c) abc abc_______
Format String.Format(“{0:C}”, 123.45) $123.45
Format String.Format(“{0:0000}”, 5) 0005
Format $“{st1}-{st2}” Ui,Path Ui-Path
Format st.ToString(“N2”) 1234.5 1,234.50
Format String.Format(“{0,10}”, st) UiPath UiPath
Format String.Format(“{0,-10}”, st) UiPath UiPath
Format String.Format(“{0:D4}”, 9) 0009
Format String.Format(“{0:MM/dd/yyyy}”, dateVar) 2025-06-01 06/01/2025
LINQ New String(st.Where(Function(c) Char.IsLetter(c)).ToArray) A1B2C3 ABC
LINQ New String(st.Distinct.ToArray) aabbcc abc
LINQ st.Where(Function(c) Char.IsDigit(c)).Count abc123 3
LINQ st.Reverse.ToArray abc {‘c’,‘b’,‘a’}
LINQ New String(st.Where(Function(c) Not Char.IsWhiteSpace(c)).ToArray) a b c abc
LINQ String.Join(“”, st.ToCharArray().Reverse) abc cba
LINQ st.Where(Function(c) Char.IsLetter(c)).FirstOrDefault 123abc a
LINQ st.Count(Function(c) c = "a"c) banana 3
LINQ st.Select(Function(c) Char.ToUpper(c)).ToArray abc {‘A’,‘B’,‘C’}
LINQ String.Concat(st.OrderBy(Function(c) c)) cba abc

Example:

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Category Example Sample Input Expected Output
DateTime Now.ToString(“dd-MM-yyyy”) 01-06-2025
DateTime Now.ToString(“yyyyMMdd_HHmmss”) 20250601_153000
DateTime Now.AddDays(7).ToString(“MMMM dd”) June 08
DateTime CDate(“2025-06-01”).ToString(“ddd”) Sun
DateTime Today.ToShortDateString 01/06/2025
DateTime DateTime.Now.ToString(“HH:mm:ss”) 15:30:00
DateTime Now.ToString(“dddd, dd MMMM yyyy”) Sunday, 01 June 2025
DateTime DateTime.ParseExact(“01-06-2025”, “dd-MM-yyyy”, Nothing).ToString(“MM/yyyy”) 06/2025
DateTime DateDiff(DateInterval.Day, Date.Parse(“2024-05-01”), Now).ToString 396
DateTime DateTime.UtcNow.ToString(“yyyy-MM-ddTHH:mm:ssZ”) 2025-06-01T10:00:00Z
Misc Guid.NewGuid.ToString d4b7e85f-1b01-4f6b-a6f4-4cdbb4f02db8
Misc Convert.ToString(Nothing)
Misc If(st.Contains(“Error”),“Failed”,“Success”) No Error Found Success
Misc st.Insert(3,“X”) ABCD ABCXD
Misc Microsoft.VisualBasic.Strings.StrReverse(st) ABCD DCBA
Misc System.IO.Path.GetFileName(path) C:\Users\file.txt file.txt
Misc System.IO.Path.GetExtension(path) C:\Users\file.txt .txt
Misc Uri.EscapeDataString(st) Raj Kumar Raj%20Kumar
Misc HttpUtility.HtmlEncode(st)
<div>
Misc st.Normalize(System.Text.NormalizationForm.FormD) naïve naïve

Example:

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Category Example Sample Input Expected Output
Regex Regex.Match(st, (?<=ID:)\d+).Value User ID:12345 12345
Regex Regex.Matches(st, \b\w{5}\b) Apple Mango Grape {‘Apple’,‘Mango’,‘Grape’}
Regex Regex.Match(st,(?<=Start)(.*)(?=End)).Value StartMiddleEnd Middle
Regex Regex.Replace(st,\b[A-Z]{2,}\b,) HELLO test test
Regex Regex.Match(st, \d{2}/\d{2}/\d{4}).Value Date: 01/06/2025 01-06-2025
Regex Regex.Matches(st, [A-Z][a-z]+).Cast(Of Match).Select(Function(m) m.Value).ToArray John Doe {‘John’,‘Doe’}
Regex Regex.Match(st, [A-Z]{2}\d{6}).Value PAN: AB123456 AB123456
Regex Regex.Replace(st,[A-Z],) AbC123 b123
Regex Regex.Match(st,(?<=Rs. )\d+).Value Amount Rs. 5000 5000
Regex Regex.Match(st,(?<=Name: ).*?(?=, Age)).Value Name: Raj, Age: 30 Raj
Array arrString.Contains(value) {‘key’,‘value’} TRUE
Array String.Join(, arrString.OrderBy(Function(x) x)) {‘z’,‘a’,‘m’} a,m,z
Array arrString.Distinct.ToArray {‘a’,‘b’,‘a’} {‘a’,‘b’}
Array arrString.Where(Function(x) x.Contains(INR)).ToArray {‘100 INR’,‘USD 200’} {‘100 INR’}
Array arrString.Count(Function(x) x.StartsWith(A)) {‘Apple’,‘Banana’,‘Avocado’} 2
Array String.Join(Environment.NewLine, arrString) {‘One’,‘Two’} One
Two
Array arrString.Skip(1).Take(3).ToArray {‘A’,‘B’,‘C’,‘D’} {‘B’,‘C’,‘D’}
Array arrString.First(Function(x) x.Length > 5) {‘Cat’,‘Animal’,‘Giraffe’} Animal
Array arrString.All(Function(x) x.Contains(Valid)) {‘ValidID’,‘ValidCode’} TRUE
Array arrString.Aggregate(Function(a,b) a + + b) {‘One’,‘Two’,‘Three’}

Example:

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