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Regular Expressions in Wolfram Language
Wolfram Language offers built-in support for regular expressions. Here are some examples of common regexp-related tasks in Wolfram Language.
```wolfram
(* This tests whether a pattern matches a string. *)
StringMatchQ["peach", RegularExpression["p([a-z]+)ch"]]
(* In Wolfram Language, we don't need to compile the regular expression separately. *)
regex = RegularExpression["p([a-z]+)ch"]
(* This finds the match for the regexp. *)
StringCases["peach punch", regex]
(* This finds the first match but returns the start and end positions. *)
StringPosition["peach punch", regex]
(* The Submatch variants include information about both the whole-pattern matches and the submatches within those matches. *)
StringCases["peach punch", regex :> {"$0", "$1"}]
(* To find all matches for a regexp: *)
StringCases["peach punch pinch", regex]
(* To limit the number of matches: *)
StringCases["peach punch pinch", regex, 2]
(* Our examples above had string arguments. We can also provide byte arrays. *)
StringMatchQ[FromCharacterCode[ToCharacterCode["peach"]], regex]
(* The StringReplace function can be used to replace subsets of strings with other values. *)
StringReplace["a peach", regex -> "<fruit>"]
(* We can use a function to transform matched text. *)
StringReplace["a peach", regex :> ToUpperCase[#] &]When using regular expressions in Wolfram Language, we typically use the RegularExpression function to create a regular expression pattern. This pattern can then be used with various string manipulation functions like StringMatchQ, StringCases, StringPosition, and StringReplace.
The StringCases function is particularly versatile, allowing us to extract matches, submatches, and even transform the matched text.
For replacing text, StringReplace can be used with either a simple replacement string or a function that transforms the matched text.
Wolfram Language’s regular expression capabilities are quite powerful and integrate well with its other string manipulation functions. For a complete reference on Wolfram Language regular expressions, check the Wolfram Language documentation.