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strtrim

Remove leading and trailing whitespace from strings

Syntax


            
             newStr = strtrim(str)

Description

example

Note

strip is recommended over strtrim because it provides greater flexibility and allows vectorization. For additional information, see Alternative Functionality .

newStr = strtrim( str ) removes leading and trailing whitespace characters from str and returns the result as newStr . However, strtrim does not remove significant whitespace characters. For example, strtrim removes leading and trailing space and tab characters, but does not remove the nonbreaking space character, char(160) .

Examples

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Remove Leading Whitespace from Character Vector

Open Live Script

Create a character vector with spaces and a tab character as leading whitespace.

chr = sprintf('  \t   Remove    leading whitespace')

chr = 
'  	   Remove    leading whitespace'

Remove the leading tab and spaces.

newChr = strtrim(chr)

newChr = 
'Remove    leading whitespace'

strtrim removes the leading whitespace characters, but not the whitespace between other characters.

Remove Leading and Trailing Spaces from String Array

Open Live Script

Create a string array.

str = ["   Gemini    ","   Apollo    ";
       "   ISS       ","   Skylab    "]

str = 2x2 string
    "   Gemini    "    "   Apollo    "
    "   ISS       "    "   Skylab    "

Remove leading and trailing whitespace with the strtrim function.

newStr = strtrim(str)

newStr = 2x2 string
    "Gemini"    "Apollo"
    "ISS"       "Skylab"

Remove Leading and Trailing Whitespace from Cell Array

Open Live Script

Remove the leading and trailing whitespace from all the character vectors in a cell array and display them.

chr = {'     Trim leading whitespace';
       'Trim trailing whitespace     '}

chr = 2x1 cell
    {'     Trim leading whitespace' }
    {'Trim trailing whitespace     '}

newChr = strtrim(chr)

newChr = 2x1 cell
    {'Trim leading whitespace' }
    {'Trim trailing whitespace'}

Keep Nonbreaking Space Character

Open Live Script

Create a character vector that includes the nonbreaking space character, char(160) , as a trailing whitespace character.

chr = '     Keep nonbreaking space';
chr = [chr char(160) '     '];

Display chr between | symbols to show the leading and trailing whitespace.

['|' chr '|']

ans = 
'|     Keep nonbreaking space      |'

Remove the leading and trailing whitespace characters.

newChr = strtrim(chr);

Display newChr between | symbols. strtrim removes the space characters but leaves the nonbreaking space at the end of newChr .

['|' newChr '|']

ans = 
'|Keep nonbreaking space |'

Input Arguments

collapse all

`str` — Input text
character array | cell array of character arrays | string array

Input text, specified as a character array or as a cell array of character arrays, or a string array.

Algorithms

strtrim does not remove significant whitespace characters.

This table shows the most common characters that are significant whitespace characters and their descriptions. For more information, see Whitespace character .

Significant Whitespace Character	Description
`char(133)`	Next line
`char(160)`	Nonbreaking space
`char(8199)`	Figure space
`char(8239)`	Narrow no-break space

Alternative Functionality

Update code that makes use of strtrim to use strip instead. For example:

Not Recommended	Recommended
str = " test "; newStr = strtrim(str) newStr = "test" str = " test "; newStr = strip(str) newStr = "test"

Extended Capabilities

Tall Arrays
Calculate with arrays that have more rows than fit in memory.

This function fully supports tall arrays. For more information, see Tall Arrays .

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

Input text must be string scalar or a character array.
Input values must be in the range 0–127.
Generated code returns an empty output as a 1-by-0 character array.

Thread-Based Environment
Run code in the background using MATLAB® `backgroundPool` or accelerate code with Parallel Computing Toolbox™ `ThreadPool` .

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment .

Distributed Arrays
Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

Usage notes and limitations:

str must be a string array or cell array of character vectors.

For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox) .

Version History

Introduced before R2006a

strtrim

Syntax

Description

Examples

Remove Leading Whitespace from Character Vector

Remove Leading and Trailing Spaces from String Array

Remove Leading and Trailing Whitespace from Cell Array

Keep Nonbreaking Space Character

Input Arguments

str — Input text character array | cell array of character arrays | string array

Algorithms

Alternative Functionality

Extended Capabilities

Tall Arrays Calculate with arrays that have more rows than fit in memory.

C/C++ Code Generation Generate C and C++ code using MATLAB® Coder™.

Thread-Based Environment Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool .

Distributed Arrays Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

Version History

See Also

`str` — Input text
character array | cell array of character arrays | string array

Tall Arrays
Calculate with arrays that have more rows than fit in memory.

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Thread-Based Environment
Run code in the background using MATLAB® `backgroundPool` or accelerate code with Parallel Computing Toolbox™ `ThreadPool` .

Distributed Arrays
Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.