 |
BUILT-IN MATHEMATICA SYMBOL
StringExpression 
or StringExpression[s1, s2, ...]
represents a sequence of strings and symbolic string objects 
.
Details
yields an ordinary string obtained by concatenating the characters in the 
. - The following objects can appear in StringExpression:
-
"string" a literal string of characters _ any single character __ any substring of one or more characters ___ any substring of zero or more characters 
, 
, x___ substrings given the name x x:pattern pattern given the name x pattern.. pattern repeated one or more times pattern... pattern repeated zero or more times 
or 
a pattern matching at least one of the 
patt/;cond a pattern for which cond evaluates to True pattern?test a pattern for which test yields True for each character Whitespace a sequence of whitespace characters NumberString the characters of a number DatePattern[spec] the characters of a date charobj an object representing a character class (see below) RegularExpression["regexp"] substring matching a regular expression StringExpression[...] an arbitrary string expression - The following represent classes of characters:
-
{c1,c2,...} any of the 
Characters["c1c2..."] any of the 
CharacterRange["c1","c2"] any character in the range 
to 
HexadecimalCharacter hexadecimal digit 0-9, a-f, A-F DigitCharacter digit 0-9 LetterCharacter letter WhitespaceCharacter space, newline, tab, or other whitespace character WordCharacter letter or digit Except[p] any character except ones matching p - The following represent positions in strings:
-
StartOfString start of the whole string EndOfString end of the whole string StartOfLine start of a line EndOfLine end of a line WordBoundary boundary between word characters and others Except[WordBoundary] anywhere except a word boundary - When constructs like
or 
are present, there may be several different ways in which a given StringExpression can match a particular string. - By default, Mathematica will use the one that makes pattern elements that appear earlier in the StringExpression match the longest possible substrings.
- The following determine which match will be used if there are several possibilities:
-
Shortest[p] the shortest consistent match for p Longest[p] the longest consistent match for p (default) - In matching ordinary expressions instead of strings, the shortest instead of the longest consistent match is used.
- StringExpression objects can be used in many string manipulation functions, including StringReplace, StringCases, StringSplit, and StringMatchQ.
- StringExpression has attributes Flat and OneIdentity.
New in 5.1 | Last modified in 7
