String functions

Learn how to use and combine different string functions in APL

The table summarizes the string functions available in APL.

Name	Description
base64_decode_toarray	Decodes a Base64-encoded string into an array of bytes.
base64_decode_tostring	Decodes a base64 string to a UTF-8 string.
base64_encode_fromarray	Converts a sequence of bytes into a Base64-encoded string.
base64_encode_tostring	Encodes a string as base64 string.
coalesce	Evaluates a list of expressions and returns the first non-null (or non-empty for string) expression.
countof_regex	Counts occurrences of a substring in a string. Regex matches don’t.
countof	Counts occurrences of a substring in a string.
extract_all	Gets all matches for a regular expression from a text string.
extract	Gets a match for a regular expression from a text string.
format_bytes	Formats a number of bytes as a string including bytes units
format_url	Formats an input string into a valid URL by adding the necessary protocol if it’s escaping illegal URL characters.
gettype	Returns the runtime type of its single argument.
indexof	Function reports the zero-based index of the first occurrence of a specified string within input string.
isascii	Checks whether all characters in an input string are ASCII characters.
isempty	Returns true if the argument is an empty string or is null.
isnotempty	Returns true if the argument isn’t an empty string or a null.
isnotnull	Returns true if the argument isn’t null.
isnull	Evaluates its sole argument and returns a bool value indicating if the argument evaluates to a null value.
parse_bytes	Parses a string including byte size units and returns the number of bytes
parse_csv	Splits a given string representing a single record of comma-separated values and returns a string array with these values.
parse_json	Interprets a string as a JSON value and returns the value as dynamic.
parse_url	Parses an absolute URL string and returns a dynamic object contains all parts of the URL.
parse_urlquery	Parses a URL query string and returns a dynamic object contains the Query parameters.
quote	Returns a string representing the input enclosed in double quotes, with internal quotes and escape sequences handled appropriately.
replace_regex	Replaces all regex matches with another string.
replace_string	Replaces all string matches with another string.
replace	Replace all regex matches with another string.
reverse	Function makes reverse of input string.
split	Splits a given string according to a given delimiter and returns a string array with the contained substrings.
strcat_delim	Concatenates between 2 and 64 arguments, with delimiter, provided as first argument.
strcat	Concatenates between 1 and 64 arguments.
strcmp	Compares two strings.
string-size	Returns the length, in characters, of the input string.
strlen	Returns the length, in characters, of the input string.
strrep	Repeats given string provided number of times (default = 1).
substring	Extracts a substring from a source string.
tolower	Converts a string to lower case.
totitle	Converts a string to title case.
toupper	Converts a string to upper case.
translate	Substitutes characters in a string, one by one, based on their position in two input lists.
trim_end_regex	Removes trailing match of the specified regular expression.
trim_end	Removes trailing match of the specified cutset.
trim_regex	Removes all leading and trailing matches of the specified regular expression.
trim_space	Removes all leading and trailing whitespace from a string.
trim_start_regex	Removes leading match of the specified regular expression.
trim_start	Removes leading match of the specified cutset.
trim	Removes all leading and trailing matches of the specified cutset.
unicode_codepoints_from_string	Converts a UTF-8 string into an array of Unicode code points.
unicode_codepoints_to_string	Converts an array of Unicode code points into a UTF-8 encoded string.
url_decode	Converts encoded URL into a regular URL representation.
url_encode	Converts characters of the input URL into a format that can be transmitted over the Internet.