Wolfram: String Functions
There are about 100 functions on string. To list them all, type
?*String*

Is String
StringQ
-
return True if argument is string.
Length
StringLength
-
return the count of chars.
StringLength["abc"] (* 3 *)
Wolfram. String
- Wolfram: String
- Wolfram: String Functions
- Wolfram: Get SubString, by Index
- Wolfram: Get SubString, by Pattern
- Wolfram: Delete SubString
- Wolfram: String Split
- Wolfram: String Join
- Wolfram: String Insert
- Wolfram: Convert to String
- Wolfram: Convert to Binary, Hexadecimal, Base 64, etc.
- Wolfram: String Template
- Wolfram: String Match
- Wolfram: String Replace
- Wolfram: Regular Expression
- Wolfram: String Expression
- Wolfram: StringExpression Pattern Syntax
- Wolfram: RegularExpression vs StringExpression