# GDScript offers built-in support for regular expressions.
# Here are some examples of common regexp-related tasks in GDScript.

extends Node

func _ready():
    # This tests whether a pattern matches a string.
    var regex = RegEx.new()
    regex.compile("p([a-z]+)ch")
    var result = regex.search("peach")
    print(result != null)

    # Many methods are available on the RegEx object. Here's
    # a match test like we saw earlier.
    print(regex.search("peach") != null)

    # This finds the match for the regexp.
    result = regex.search("peach punch")
    if result:
        print(result.get_string())

    # This also finds the first match but returns the
    # start and end indexes for the match instead of the
    # matching text.
    result = regex.search("peach punch")
    if result:
        print("idx:", [result.get_start(), result.get_end()])

    # The captured groups include information about
    # both the whole-pattern matches and the submatches
    # within those matches. For example this will return
    # information for both p([a-z]+)ch and ([a-z]+).
    result = regex.search("peach punch")
    if result:
        print(result.get_strings())

    # Similarly this will return information about the
    # indexes of matches and submatches.
    result = regex.search("peach punch")
    if result:
        print([result.get_start(), result.get_end(), 
               result.get_start(1), result.get_end(1)])

    # To find all matches for a regexp, we can use search_all.
    var results = regex.search_all("peach punch pinch")
    var matches = []
    for res in results:
        matches.append(res.get_string())
    print(matches)

    # These search_all results are available for the other
    # functions we saw above as well.
    results = regex.search_all("peach punch pinch")
    var all_indices = []
    for res in results:
        all_indices.append([res.get_start(), res.get_end(), 
                            res.get_start(1), res.get_end(1)])
    print("all:", all_indices)

    # The regexp package can also be used to replace
    # subsets of strings with other values.
    var replaced = regex.sub("a peach", "<fruit>", true)
    print(replaced)

    # The sub_func variant allows you to transform matched
    # text with a given function.
    func to_upper(result: RegExMatch) -> String:
        return result.get_string().to_upper()

    replaced = regex.sub("a peach", to_upper)
    print(replaced)

# Output:
# true
# true
# peach
# idx: [0, 5]
# [peach, ea]
# [0, 5, 1, 3]
# [peach, punch, pinch]
# all: [[0, 5, 1, 3], [6, 11, 7, 9], [12, 17, 13, 15]]
# a <fruit>
# a PEACH

# For a complete reference on GDScript regular expressions,
# check the RegEx class documentation in the Godot docs.