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String Manipulation
Integrated into the core Mathematica language is industrial-strength string manipulation, not only with ordinary regular expressions, but also with Mathematica's own powerful general symbolic string-pattern language.
Reference
— a string, allowing Unicode or special characters
Structural Operations
StringJoin (<>) — join strings together
StringLength — length of a string
StringSplit — split a string into words or other units
StringTake, StringDrop — take or drop parts of a string
String Patterns »
StringExpression — a symbolic string expression including symbolic string patterns
Longest ▪ Shortest ▪ Except ▪ Whitespace ▪ NumberString ▪ ...
Operations on Strings »
StringReplace — make replacements for string patterns
StringCases — find cases of string patterns
StringFreeQ — test whether a string is free of a string pattern
StringCount ▪ StringPosition ▪ ...
String Alignment & Comparison »
SequenceAlignment — find matching sequences in strings
Nearest — find strings nearest in edit distance
HammingDistance ▪ EditDistance ▪ LongestCommonSubsequence ▪ 
Sort — sort strings alphabetically or otherwise
Riffle — riffle lists of objects 
DictionaryLookup — look up strings in an English dictionary
ToString, ToExpression — convert between expressions and strings >>>
ImportString, ExportString — translate many formats of strings
Character Operations »
Characters — break a string into a list of characters
ToUpperCase ▪ ToCharacterCode ▪ LetterQ ▪ ...
Operations on File Names »
FileNameSplit ▪ FileNameTake ▪ FileBaseName ▪ ExpandFileName ▪ 
