String

Built-in string class.

Description

This is the built-in string class (and the one used by GDScript). It supports Unicode and provides all necessary means for string handling. Strings are reference-counted and use a copy-on-write approach, so passing them around is cheap in resources.

Tutorials

Constructors

String

String ( )

String

String ( String from )

String

String ( NodePath from )

String

String ( StringName from )

Methods

bool

begins_with ( String text ) const

PackedStringArray

bigrams ( ) const

int

bin_to_int ( ) const

String

c_escape ( ) const

String

c_unescape ( ) const

String

capitalize ( ) const

int

casecmp_to ( String to ) const

String

chr ( int char ) static

bool

contains ( String what ) const

int

count ( String what, int from=0, int to=0 ) const

int

countn ( String what, int from=0, int to=0 ) const

String

dedent ( ) const

bool

ends_with ( String text ) const

int

find ( String what, int from=0 ) const

int

findn ( String what, int from=0 ) const

String

format ( Variant values, String placeholder="{_}" ) const

String

get_base_dir ( ) const

String

get_basename ( ) const

String

get_extension ( ) const

String

get_file ( ) const

String

get_slice ( String delimiter, int slice ) const

int

get_slice_count ( String delimiter ) const

String

get_slicec ( int delimiter, int slice ) const

int

hash ( ) const

int

hex_to_int ( ) const

String

humanize_size ( int size ) static

String

indent ( String prefix ) const

String

insert ( int position, String what ) const

bool

is_absolute_path ( ) const

bool

is_empty ( ) const

bool

is_relative_path ( ) const

bool

is_subsequence_of ( String text ) const

bool

is_subsequence_ofn ( String text ) const

bool

is_valid_filename ( ) const

bool

is_valid_float ( ) const

bool

is_valid_hex_number ( bool with_prefix=false ) const

bool

is_valid_html_color ( ) const

bool

is_valid_identifier ( ) const

bool

is_valid_int ( ) const

bool

is_valid_ip_address ( ) const

String

join ( PackedStringArray parts ) const

String

json_escape ( ) const

String

left ( int length ) const

int

length ( ) const

String

lpad ( int min_length, String character=" " ) const

String

lstrip ( String chars ) const

bool

match ( String expr ) const

bool

matchn ( String expr ) const

PackedByteArray

md5_buffer ( ) const

String

md5_text ( ) const

int

naturalnocasecmp_to ( String to ) const

int

nocasecmp_to ( String to ) const

String

num ( float number, int decimals=-1 ) static

String

num_int64 ( int number, int base=10, bool capitalize_hex=false ) static

String

num_scientific ( float number ) static

String

num_uint64 ( int number, int base=10, bool capitalize_hex=false ) static

String

pad_decimals ( int digits ) const

String

pad_zeros ( int digits ) const

String

path_join ( String file ) const

String

repeat ( int count ) const

String

replace ( String what, String forwhat ) const

String

replacen ( String what, String forwhat ) const

int

rfind ( String what, int from=-1 ) const

int

rfindn ( String what, int from=-1 ) const

String

right ( int length ) const

String

rpad ( int min_length, String character=" " ) const

PackedStringArray

rsplit ( String delimiter, bool allow_empty=true, int maxsplit=0 ) const

String

rstrip ( String chars ) const

PackedByteArray

sha1_buffer ( ) const

String

sha1_text ( ) const

PackedByteArray

sha256_buffer ( ) const

String

sha256_text ( ) const

float

similarity ( String text ) const

String

simplify_path ( ) const

PackedStringArray

split ( String delimiter, bool allow_empty=true, int maxsplit=0 ) const

PackedFloat32Array

split_floats ( String delimiter, bool allow_empty=true ) const

String

strip_edges ( bool left=true, bool right=true ) const

String

strip_escapes ( ) const

String

substr ( int from, int len=-1 ) const

PackedByteArray

to_ascii_buffer ( ) const

String

to_camel_case ( ) const

float

to_float ( ) const

int

to_int ( ) const

String

to_lower ( ) const

String

to_pascal_case ( ) const

String

to_snake_case ( ) const

String

to_upper ( ) const

PackedByteArray

to_utf16_buffer ( ) const

PackedByteArray

to_utf32_buffer ( ) const

PackedByteArray

to_utf8_buffer ( ) const

String

trim_prefix ( String prefix ) const

String

trim_suffix ( String suffix ) const

int

unicode_at ( int at ) const

String

uri_decode ( ) const

String

uri_encode ( ) const

String

validate_node_name ( ) const

String

xml_escape ( bool escape_quotes=false ) const

String

xml_unescape ( ) const

Operators

bool

operator != ( String right )

bool

operator != ( StringName right )

String

operator % ( Variant right )

String

operator + ( String right )

String

operator + ( int right )

bool

operator < ( String right )

bool

operator <= ( String right )

bool

operator == ( String right )

bool

operator == ( StringName right )

bool

operator > ( String right )

bool

operator >= ( String right )

String

operator [] ( int index )

Constructor Descriptions

Constructs an empty String ("").


Constructs a String as a copy of the given String.


Constructs a new String from the given NodePath.


Constructs a new String from the given StringName.

Method Descriptions

Returns true if the string begins with the given string.


Returns an array containing the bigrams (pairs of consecutive letters) of this string.

print("Bigrams".bigrams()) # Prints "[Bi, ig, gr, ra, am, ms]"

  • int bin_to_int ( ) const

Converts a string containing a binary number into an integer. Binary strings can either be prefixed with 0b or not, and they can also start with a - before the optional prefix.

print("0b101".bin_to_int()) # Prints "5".
print("101".bin_to_int()) # Prints "5".

Returns a copy of the string with special characters escaped using the C language standard.


Returns a copy of the string with escaped characters replaced by their meanings. Supported escape sequences are \', \", \?, \\, \a, \b, \f, \n, \r, \t, \v.

Note: Unlike the GDScript parser, this method doesn't support the \uXXXX escape sequence.


Changes the case of some letters. Replaces underscores with spaces, adds spaces before in-word uppercase characters, converts all letters to lowercase, then capitalizes the first letter and every letter following a space character. For capitalize camelCase mixed_with_underscores, it will return Capitalize Camel Case Mixed With Underscores.


Performs a case-sensitive comparison to another string. Returns -1 if less than, 1 if greater than, or 0 if equal. "less than" or "greater than" are determined by the Unicode code points of each string, which roughly matches the alphabetical order.

Behavior with different string lengths: Returns 1 if the "base" string is longer than the to string or -1 if the "base" string is shorter than the to string. Keep in mind this length is determined by the number of Unicode codepoints, not the actual visible characters.

Behavior with empty strings: Returns -1 if the "base" string is empty, 1 if the to string is empty or 0 if both strings are empty.

To get a boolean result from a string comparison, use the == operator instead. See also nocasecmp_to and naturalnocasecmp_to.


Directly converts an decimal integer to a unicode character. Tables of these characters can be found in various locations, for example here.

print(String.chr(65)) # Prints "A"
print(String.chr(129302)) # Prints "🤖" (robot face emoji)

Returns true if the string contains the given string.


Returns the number of occurrences of substring what between from and to positions. If from and to equals 0 the whole string will be used. If only to equals 0 the remained substring will be used.


Returns the number of occurrences of substring what (ignoring case) between from and to positions. If from and to equals 0 the whole string will be used. If only to equals 0 the remained substring will be used.


Returns a copy of the string with indentation (leading tabs and spaces) removed. See also indent to add indentation.


Returns true if the string ends with the given string.


Returns the index of the first case-sensitive occurrence of the specified string in this instance, or -1. Optionally, the starting search index can be specified, continuing to the end of the string.

Note: If you just want to know whether a string contains a substring, use the in operator as follows:

print("i" in "team") # Will print `false`.

Returns the index of the first case-insensitive occurrence of the specified string in this instance, or -1. Optionally, the starting search index can be specified, continuing to the end of the string.


Formats the string by replacing all occurrences of placeholder with the elements of values.

values can be a Dictionary or an Array. Any underscores in placeholder will be replaced with the corresponding keys in advance. Array elements use their index as keys.

# Prints: Waiting for Godot is a play by Samuel Beckett, and Godot Engine is named after it.
var use_array_values = "Waiting for {0} is a play by {1}, and {0} Engine is named after it."
print(use_array_values.format(["Godot", "Samuel Beckett"]))

# Prints: User 42 is Godot.
print("User {id} is {name}.".format({"id": 42, "name": "Godot"}))

Some additional handling is performed when values is an array. If placeholder does not contain an underscore, the elements of the array will be used to replace one occurrence of the placeholder in turn; If an array element is another 2-element array, it'll be interpreted as a key-value pair.

# Prints: User 42 is Godot.
print("User {} is {}.".format([42, "Godot"], "{}"))
print("User {id} is {name}.".format([["id", 42], ["name", "Godot"]]))

  • String get_base_dir ( ) const

If the string is a valid file path, returns the base directory name.


  • String get_basename ( ) const

If the string is a valid file path, returns the full file path without the extension.


  • String get_extension ( ) const

Returns the extension without the leading period character (.) if the string is a valid file name or path. If the string does not contain an extension, returns an empty string instead.

print("/path/to/file.txt".get_extension())  # "txt"
print("file.txt".get_extension())  # "txt"
print("file.sample.txt".get_extension())  # "txt"
print(".txt".get_extension())  # "txt"
print("file.txt.".get_extension())  # "" (empty string)
print("file.txt..".get_extension())  # "" (empty string)
print("txt".get_extension())  # "" (empty string)
print("".get_extension())  # "" (empty string)

If the string is a valid file path, returns the filename.


Splits a string using a delimiter and returns a substring at index slice. Returns an empty string if the index doesn't exist.

This is a more performant alternative to split for cases when you need only one element from the array at a fixed index.

Example:

print("i/am/example/string".get_slice("/", 2)) # Prints 'example'.

  • int get_slice_count ( String delimiter ) const

Splits a string using a delimiter and returns a number of slices.


Splits a string using a Unicode character with code delimiter and returns a substring at index slice. Returns an empty string if the index doesn't exist.

This is a more performant alternative to split for cases when you need only one element from the array at a fixed index.


  • int hash ( ) const

Returns the 32-bit hash value representing the string's contents.

Note: Strings with equal content will always produce identical hash values. However, the reverse is not true. Returning identical hash values does not imply the strings are equal, because different strings can have identical hash values due to hash collisions.


  • int hex_to_int ( ) const

Converts a string containing a hexadecimal number into an integer. Hexadecimal strings can either be prefixed with 0x or not, and they can also start with a - before the optional prefix.

print("0xff".hex_to_int()) # Prints "255".
print("ab".hex_to_int()) # Prints "171".

Converts an integer representing a number of bytes into a human-readable form.

Note that this output is in IEC prefix format, and includes B, KiB, MiB, GiB, TiB, PiB, and EiB.


Returns a copy of the string with lines indented with prefix.

For example, the string can be indented with two tabs using "\t\t", or four spaces using "    ". The prefix can be any string so it can also be used to comment out strings with e.g. "# ". See also dedent to remove indentation.

Note: Empty lines are kept empty.


Returns a copy of the string with the substring what inserted at the given position.


  • bool is_absolute_path ( ) const

Returns true if the string is a path to a file or directory and its starting point is explicitly defined. This includes res://, user://, C:\, /, etc.


  • bool is_empty ( ) const

Returns true if the length of the string equals 0.


  • bool is_relative_path ( ) const

Returns true if the string is a path to a file or directory and its starting point is implicitly defined within the context it is being used. The starting point may refer to the current directory (./), or the current Node.


Returns true if this string is a subsequence of the given string.


Returns true if this string is a subsequence of the given string, without considering case.


  • bool is_valid_filename ( ) const

Returns true if this string is free from characters that aren't allowed in file names, those being:

: / \ ? * " | % < >


  • bool is_valid_float ( ) const

Returns true if this string contains a valid float. This is inclusive of integers, and also supports exponents:

print("1.7".is_valid_float()) # Prints "true"
print("24".is_valid_float()) # Prints "true"
print("7e3".is_valid_float()) # Prints "true"
print("Hello".is_valid_float()) # Prints "false"

  • bool is_valid_hex_number ( bool with_prefix=false ) const

Returns true if this string contains a valid hexadecimal number. If with_prefix is true, then a validity of the hexadecimal number is determined by 0x prefix, for instance: 0xDEADC0DE.


  • bool is_valid_html_color ( ) const

Returns true if this string contains a valid color in hexadecimal HTML notation. Other HTML notations such as named colors or hsl() colors aren't considered valid by this method and will return false.


  • bool is_valid_identifier ( ) const

Returns true if this string is a valid identifier. A valid identifier may contain only letters, digits and underscores (_) and the first character may not be a digit.

print("good_ident_1".is_valid_identifier()) # Prints "true"
print("1st_bad_ident".is_valid_identifier()) # Prints "false"
print("bad_ident_#2".is_valid_identifier()) # Prints "false"

  • bool is_valid_int ( ) const

Returns true if this string contains a valid integer.

print("7".is_valid_int()) # Prints "true"
print("14.6".is_valid_int()) # Prints "false"
print("L".is_valid_int()) # Prints "false"
print("+3".is_valid_int()) # Prints "true"
print("-12".is_valid_int()) # Prints "true"

  • bool is_valid_ip_address ( ) const

Returns true if this string contains only a well-formatted IPv4 or IPv6 address. This method considers reserved IP addresses such as 0.0.0.0 as valid.


Returns a String which is the concatenation of the parts. The separator between elements is the string providing this method.

Example:

print(", ".join(["One", "Two", "Three", "Four"]))

  • String json_escape ( ) const

Returns a copy of the string with special characters escaped using the JSON standard.


Returns a number of characters from the left of the string. If negative length is used, the characters are counted downwards from String's length.

Examples:

print("sample text".left(3)) #prints "sam"
print("sample text".left(-3)) #prints "sample t"

  • int length ( ) const

Returns the number of characters in the string.


Formats a string to be at least min_length long by adding characters to the left of the string.


Returns a copy of the string with characters removed from the left. The chars argument is a string specifying the set of characters to be removed.

Note: The chars is not a prefix. See trim_prefix method that will remove a single prefix string rather than a set of characters.


Does a simple case-sensitive expression match, where "*" matches zero or more arbitrary characters and "?" matches any single character except a period ("."). An empty string or empty expression always evaluates to false.


Does a simple case-insensitive expression match, where "*" matches zero or more arbitrary characters and "?" matches any single character except a period ("."). An empty string or empty expression always evaluates to false.


Returns the MD5 hash of the string as an array of bytes.


Returns the MD5 hash of the string as a string.


  • int naturalnocasecmp_to ( String to ) const

Performs a case-insensitive natural order comparison to another string. Returns -1 if less than, 1 if greater than, or 0 if equal. "less than" or "greater than" are determined by the Unicode code points of each string, which roughly matches the alphabetical order. Internally, lowercase characters will be converted to uppercase during the comparison.

When used for sorting, natural order comparison will order suites of numbers as expected by most people. If you sort the numbers from 1 to 10 using natural order, you will get [1, 2, 3, ...] instead of [1, 10, 2, 3, ...].

Behavior with different string lengths: Returns 1 if the "base" string is longer than the to string or -1 if the "base" string is shorter than the to string. Keep in mind this length is determined by the number of Unicode codepoints, not the actual visible characters.

Behavior with empty strings: Returns -1 if the "base" string is empty, 1 if the to string is empty or 0 if both strings are empty.

To get a boolean result from a string comparison, use the == operator instead. See also nocasecmp_to and casecmp_to.


Performs a case-insensitive comparison to another string. Returns -1 if less than, 1 if greater than, or 0 if equal. "less than" or "greater than" are determined by the Unicode code points of each string, which roughly matches the alphabetical order. Internally, lowercase characters will be converted to uppercase during the comparison.

Behavior with different string lengths: Returns 1 if the "base" string is longer than the to string or -1 if the "base" string is shorter than the to string. Keep in mind this length is determined by the number of Unicode codepoints, not the actual visible characters.

Behavior with empty strings: Returns -1 if the "base" string is empty, 1 if the to string is empty or 0 if both strings are empty.

To get a boolean result from a string comparison, use the == operator instead. See also casecmp_to and naturalnocasecmp_to.


Converts a float to a string representation of a decimal number.

The number of decimal places can be specified with decimals. If decimals is -1 (default), decimal places will be automatically adjusted so that the string representation has 14 significant digits (counting both digits to the left and the right of the decimal point).

Trailing zeros are not included in the string. The last digit will be rounded and not truncated.

Some examples:

String.num(3.141593)     # "3.141593"
String.num(3.141593, 3)  # "3.142"
String.num(3.14159300)   # "3.141593", no trailing zeros.
# Last digit will be rounded up here, which reduces total digit count since
# trailing zeros are removed:
String.num(42.129999, 5) # "42.13"
# If `decimals` is not specified, the total number of significant digits is 14:
String.num(-0.0000012345432123454321)     # "-0.00000123454321"
String.num(-10000.0000012345432123454321) # "-10000.0000012345"

  • String num_int64 ( int number, int base=10, bool capitalize_hex=false ) static

Converts a signed int to a string representation of a number.



  • String num_uint64 ( int number, int base=10, bool capitalize_hex=false ) static

Converts a unsigned int to a string representation of a number.


Formats a number to have an exact number of digits after the decimal point.


Formats a number to have an exact number of digits before the decimal point.


If the string is a path, this concatenates file at the end of the string as a subpath. E.g. "this/is".path_join("path") == "this/is/path".


Returns original string repeated a number of times. The number of repetitions is given by the argument.