String String operations

Function

String prototype function provides length reading, search matching, interception, replacement, filling, case conversion and type conversion capabilities.

API List

API	Description
String.len	Returns the string length. ASCII strings are measured in bytes; non-ASCII strings are measured in Unicode characters.
String.trim	Remove leading and trailing blank characters from the string and return a new string.
String.trim_start	Remove blank characters at the beginning of the string and return a new string.
String.trim_end	Remove blank characters from the end of the string and return a new string.
String.char_at	Read the character at the specified character position.
String.char_code_at	Read the Unicode code point at the specified character position.
String.parse_json	Parse JSON string into BT value.
String.parse_radix_int	Parse integer text according to the specified base.
String.parse_radix_str	Parses whitespace-delimited byte text into a UTF-8 string according to the specified base.
String.concat	Concatenate the current string and all parameters in sequence into a new string.
String.ends_with	Determine whether the string ends with the specified suffix.
String.contains	Determine whether the string contains the specified fragment.
String.index_of	Returns the position where the specified fragment first appears.
String.last_index_of	Returns the position of the last occurrence of the specified fragment.
String.repeat	Repeat the current string the number of times.
String.replace	Replace matching content in a string. Only the first occurrence of a string pattern is replaced; all matches are replaced when the Regex parameter has the g flag.
String.replace_all	Replace all matching content in the string.
String.search	Find the first matching position of a string or regular expression in the current string.
String.match	Returns string or regular expression matching results.
String.slice	Intercept the string according to the starting and ending positions.
String.split	Split a string by delimiter.
String.starts_with	Determine whether the string starts with the specified prefix.
String.substr	Intercept the string by length starting from the specified position.
String.to_lowercase	Convert a string to lowercase.
String.to_uppercase	Convert a string to uppercase.
String.to_number	Convert a string into a numeric value according to BT relaxed number rules.
String.to_string	Returns the current string itself.
String.pad_start	Pad the string at the beginning to the target length.
String.pad_end	Pad the string at the end to the target length.

Examples

Notes

String methods return new values and do not modify the original string.

- HTML escaping, escaping and tag stripping have been migrated to html library .

The parameters of char_at and char_code_at are read according to Unicode character subscripts.

- Return positions for index_of, last_index_of, search are calculated as UTF-8 byte offsets.