TRIM

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgTrim
• Last revised: 2026-02-12

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Removes surrounding substrings or characters on the left and right side of a string

Syntax

declare function Trim ( byref str as const string, [ Any ] byref trimset as const string = " " ) as string
declare function Trim ( byref str as const wstring, [ Any ] byref trimset as const wstring = Wstr(" ") ) as wstring

Usage

` result = Trim[$]( str [, [ Any ] trimset ] )

`

Parameters

str

The source string.

trimset

The substring to trim.

Return Value

Returns the trimmed string.

Description

This procedure trims surrounding characters from the left (beginning) and right (end) of a source string:

• Substrings matching trimset will be trimmed if specified, otherwise spaces (ASCII code 32) are trimmed.
• If the Any keyword is used, any character matching a character in trimset will be trimmed.

All comparisons are case-sensitive.

Examples

start GeSHi

Dim s1 As String = " ... Stuck in the middle ... "
Print "'" + Trim(s1) + "'"
Print "'" + Trim(s1, Any " .") + "'"

Dim s2 As String = "BaaBaaaaB With You aaBBaaBaa"
Print "'" + Trim(s2, "Baa") + "'"
Print "'" + Trim(s2, Any "Ba") + "'"

end GeSHi

will produce the output:

'... Stuck in the middle ...'
'Stuck in the middle'
'aaB With You aaB'
' With You '

Platform Differences

• DOS version/target of FreeBASIC does not support the wide-character version of Trim.

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __Trim.
• The string type suffix "$" is optional in the -lang fblite dialect.
• The string type suffix "$" is ignored in the -lang fb dialect, warn only with the -w suffix compile option (or -w pedantic compile option).

Differences from QB

• New to FreeBASIC

See also

• Ltrim
• Rtrim

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