Primitive type string

The primitive type of strings of characters. A string consists of Unicode characters expressed internally as UTF-16. All predicates that work with string length or string indices are based on counting UTF-16 code units.

Predicates

charAt	Returns a one-character string containing the character in the receiver at the given index (which ranges from 0 through length minus one)
codePointAt	Returns an integer for the Unicode code point value of the character starting at the given index, counted by UTF-16 code units.
codePointCount	Returns the number of Unicode code points found in the receiver between the given start index (inclusive) and end index (exclusive).
indexOf	Returns all the offsets (starting at 0) at which the given string occurs in the receiver. Has no result if the string does not occur in the receiver.
indexOf	Returns the index of the n’th (starting at 0) occurrence of the given string within the receiver, starting at the given 0-based offset. Has no result if the string does not occur in the receiver.
isLowercase	Holds when the receiver contains no upper-case letters. This includes the case where the receiver contains no letters at all, for example, if it’s an empty string or only consists of non-letter symbols.
isUppercase	Holds when the receiver contains no lower-case letters. This includes the case where the receiver contains no letters at all, for example, if it’s an empty string or only consists of non-letter symbols.
length	Returns the length of the receiver (in UTF-16 code units)
matches	Holds when the receiver matches the pattern. Patterns are matched by case sensitive string matching, and there are two wildcards: _ matches a single character, and % matches any sequence of characters. To match the actual characters _ or % in the pattern, they must be escaped using backslashes. For example, `"anythingstring%".matches("%string\\%")` holds. To match a literal backslash in front of _ or %, you must escape the backslash. Backslashes that are not part of an escape sequence are matched as literals.
prefix	Returns the substring of the receiver ending at the given 0-based exclusive offset
regexpCapture	When the given regular expression matches the entire receiver, returns the substring matched by the given capture group (starting at 1). The regex format used is Java’s Pattern.
regexpFind	Returns a substring of the receiver which matches the given regular expression. Also returns the offset within the receiver (starting at 0) at which the match occurred (occurrenceOffset), and the number of matches which occur at smaller offsets (occurrenceIndex). The regex format used is Java’s Pattern.
regexpMatch	Holds when the given regular expression matches the entire receiver. The regex format used is Java’s Pattern.
regexpReplaceAll	Returns a copy of the receiver with every substring which matches the given regular expression is replaced by the replacement. The regex format used is Java’s Pattern. The replacement string can contain references to captured groups as described in Java’s appendReplacement docs.
replaceAll	Returns a copy of the receiver with all occurrences of the target replaced by the replacement
splitAt	Returns all the substrings obtained by splitting the receiver at every occurrence of the argument. Trailing empty substrings are omitted. Splitting at an empty string returns all the characters that the receiver consists of.
splitAt	Returns the n’th (starting at 0) substring obtained by splitting the receiver at every occurrence of the argument. Trailing empty substrings are omitted. Splitting at an empty string returns all the characters that the receiver consists of.
substring	Returns the substring of the receiver which starts and ends at the given indices. Both indices are 0-based. The start index is inclusive and the end index is exclusive.
suffix	Returns the substring of the receiver starting at the given 0-based inclusive offset
toBigInt	Returns the arbitrary-precision signed integer, if any, obtained by parsing the receiver. The number may consist of an optional leading `+` or `-`, followed by one or more digits.
toDate	Returns the date, if any, obtained by parsing the receiver. The recognized formats are described in the documentation.
toFloat	Returns the 64-bit floating point number, if any, obtained by parsing the receiver. The parsing rules are described in Java’s valueOf docs.
toInt	Returns the 32-bit signed integer, if any, obtained by parsing the receiver. The number may consist of an optional leading `+` or `-`, followed by one or more digits. Has no result if the value exceeds the value range supported by the `int` type.
toLowerCase	Returns a copy of the receiver with all uppercase characters replaced by lowercase ones according to Unicode case conversion rules.
toString	Returns the receiver
toUpperCase	Returns a copy of the receiver with all lowercase characters replaced by uppercase ones according to Unicode case conversion rules.
trim	Returns a copy of the receiver with all whitespace removed from the beginning and end of the string (where whitespace is defined as Unicode code points ‘\u0000’ through ‘\u0020’ inclusive)