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Zeichen und Zeichenfolgen

Text in Character und String Arrays

Character und String Arrays stellen Speicherplatz für Textdaten in MATLAB® bereit.

  • Ein Character Array (Zeichenarray) ist eine Zeichenfolge, genauso wie ein numerisches Array eine Zahlenfolge ist. Es wird typischerweise dazu verwendet, kurze Textbausteine als Zeichenvektoren, wie c = 'Hello World', zu speichern.

  • Ein String Array (Zeichenfolgenarray) ist ein Container für Textbausteine. String Arrays stellen eine Reihe von Funktionen bereit, um mit Texten als Daten zu arbeiten. Sie können Zeichenfolgen mit Anführungszeichen, wie str = "Greetings friend", erstellen. Mit der Funktion string konvertieren Sie Daten in String Arrays.

Weitere Informationen finden Sie unter Text in String and Character Arrays oder sehen Sie sich Verwenden von String Arrays für Textdaten an.

Funktionen

alle erweitern

String Arrays

stringString array
stringsCreate string array with no characters
joinCombine strings
plusAdd numbers, append strings

Character Arrays

charCharacter array
cellstrConvert to cell array of character vectors
blanksCreate character array of blanks
newlineErstellen des Zeichens für eine neue Zeile

Character oder String Arrays

composeFormat data into multiple strings
sprintfFormat data into string or character vector
strcatHorizontales Verknüpfen von Zeichenfolgen
appendCombine strings

Konvertieren von Eingabeargumenten

convertCharsToStringsConvert character arrays to string arrays, leaving other arrays unaltered
convertStringsToCharsConvert string arrays to character arrays, leaving other arrays unaltered
convertContainedStringsToCharsConvert string arrays at any level of cell array or structure

Konvertieren zwischen Zahlen und Zeichenfolgen

doubleArrays mit doppelter Genauigkeit
stringString array
str2doubleConvert strings to double precision values
num2strConvert numbers to character array

Datentyp

ischarDetermine if input is character array
iscellstrDetermine if input is cell array of character vectors
isstringDetermine if input is string array
isStringScalar Determine if input is string array with one element

Texteigenschaften

strlengthLengths of strings
isstrpropDetermine which characters in input strings are of specified category
isletterDetermine which characters are letters
isspaceDetermine which characters are space characters

Suchen

containsErmitteln, ob ein Muster in Zeichenfolgen ausgedrückt ist
matchesDetermine if pattern matches strings
countCount occurrences of pattern in strings
endsWithDetermine if strings end with pattern
startsWithDetermine if strings start with pattern
strfindFind strings within other strings
sscanfRead formatted data from strings

Ersetzen

replaceFind and replace one or more substrings
replaceBetweenReplace substrings between start and end points
strrepFind and replace substrings

Erstellen von Mustern

patternPatterns to search and match text

Zeichen-Musterabgleich

alphanumericsPatternMatch letter and digit characters
characterListPatternMatch characters from list
digitsPattern Match digit characters
lettersPatternMatch letter characters
whitespacePatternMatch whitespace characters
wildcardPatternMatches as few characters of any type

Muster-Suchregeln

optionalPatternMake pattern optional to match
possessivePatternMatch pattern without backtracking
caseSensitivePatternMatch pattern with case sensitivity
caseInsensitivePatternMatch pattern regardless of case
asFewOfPatternMatch pattern as few times as possible
asManyOfPatternMatch pattern as many times as possible

Grenzwert-Muster

alphanumericBoundaryMatch boundary between alphanumeric and non-alphanumeric characters
digitBoundaryMatch boundary between digit characters and non-digit characters
letterBoundaryMatch boundary between letter characters and non-letter characters
whitespaceBoundaryMatch boundary between whitespace characters and non-whitespace characters
lineBoundaryMatch start or end of line
textBoundaryMatch start or end of text
lookAheadBoundaryMatch boundary before specified pattern
lookBehindBoundaryMatch boundary following specified pattern

Benutzerdefinierte Musteranzeige

maskedPatternPattern with specified display name
namedPatternDesignate named pattern

Reguläre Ausdrücke

regexpMatch regular expression (case sensitive)
regexpiMatch regular expression (case insensitive)
regexprepReplace text using regular expression
regexptranslateTranslate text into regular expression
regexpPatternPattern that matches specified regular expression
joinCombine strings
plusAdd numbers, append strings
splitSplit strings at delimiters
splitlinesSplit strings at newline characters
strjoinJoin strings in array
strsplitSplit string or character vector at specified delimiter
strtokSelected parts of strings
extractExtract substrings from strings
extractAfterExtract substrings after specified positions
extractBeforeExtract substrings before specified positions
extractBetweenExtract substrings between start and end points
eraseDelete substrings within strings
eraseBetweenDelete substrings between start and end points
extractExtract substrings from strings
extractAfterExtract substrings after specified positions
extractBeforeExtract substrings before specified positions
extractBetweenExtract substrings between start and end points
insertAfterInsert strings after specified substrings
insertBeforeInsert strings before specified substrings
padAdd leading or trailing characters to strings
stripRemove leading and trailing characters from strings
lowerConvert strings to lowercase
upperConvert strings to uppercase
reverseReverse order of characters in strings
deblankRemove trailing whitespace from ends of strings
strtrimRemove leading and trailing whitespace from strings
strjustJustify strings
matchesDetermine if pattern matches strings
strcmpVergleichen von Zeichenfolgen
strcmpiCompare strings (case insensitive)
strncmpCompare first n characters of strings (case sensitive)
strncmpiCompare first n characters of strings (case insensitive)

Themen