WolframLang: String Functions

Length

StringLength

return the count of chars. StringLength

StringLength["abc"]
(* 3 *)

Join String

(for list to string, use StringRiffle)

StringJoin[s1, s2]

Short syntax: s1 <> s2
StringJoin

StringJoin["ab", "cd", "e"]
(* "abcde" *)

"ab" <> "cd" <> "e"
(* "abcde" *)

Get Substring, by Position

StringTake[str, n]

first char to nth. StringTake

StringTake["abcde", 3] === "abc"

StringTake[str, -n]

count from right, first char to nth.

StringTake["abcde", -3] === "cde"

StringTake[str, {n}]

nth char.

StringTake["abcde", {3}] === "c"

StringTake[str, {n, m}]

nth to mth chars.

StringTake["abcde", {2,4}] === "bcd"

StringTake[str, {spec1, spec2 etc}]

return a list of result, for each spec.

StringTake["abcde", {2, {2}, {2,4}}] === {"ab", "b", "bcd"}

StringTake[{str1, str2 etc}, spec]

return a list of result, for each string.

StringTake[{"abcde", "123456"}, 2] === {"ab", "12"}
StringTake[{"abcde", "123456"}, {2}] === {"b", "2"}
StringTake[{"abcde", "123456"}, {2,4}] === {"bcd", "234"}

StringTake[{"abcde", "123456"}, {2, {2}, {2,4}}] ===
{{"ab", "b", "bcd"}, {"12", "2", "234"}}

Get Substring by Pattern

StringCases [see WolframLang: String Replace]

Insert into string

StringInsert

Insert by position StringInsert

StringInsert[ "love cat", "I ", 1 ]
(* I love cat *)

Delete substring

StringDrop

Delete parts by position. StringDrop

StringDelete

Delete parts by String pattern (regex) . StringDelete

StringTrim

Remove whitespace StringTrim

Format string

ToString

Convert number or any expression to string. ToString

StringTemplate

Template system with placeholders StringTemplate

String to list

StringSplit

split a string to a list of strings. StringSplit

(* split by whitespace *)
StringSplit[ "a b" ]
(* {"a", "b"} *)

(* split by comma *)
StringSplit[ "a,b,c", "," ]
(* {"a", "b", "c"} *)

List to string

StringRiffle

List to string. StringRiffle

StringRiffle[ {"a" , "b" , "c"}, " " ]
 (* "a b c" *)

String to Number

ToExpression

String to number. ToExpression

ToExpression[ "3" ] === 3
ToExpression[ "3.21" ] === 3.21