Position (Function)

WINDEV, WEBDEV AND WINDEV MOBILE
ONLINE HELP

Version:

Home | Sign in | English

Functions for managing strings

Position

Presentation

Example

Finding the character string

Unicode/Ansi

Characters taken into account for the punctuation and the spaces

Various

See also

Position (Function)

In french: Position

Finds the position of a character string in another character string (or in a Buffer).

You also have the ability to find the position of one of the character strings found in an array.

Versions 15 and later

This function is now available for the Android applications.

New in version 15

This function is now available for the Android applications.

Versions 16 and later

This function is now available for the Windows Phone applications.

New in version 16

This function is now available for the Windows Phone applications.

Versions 17 and later

This function is now available for the iPhone/iPad applications.

New in version 17

This function is now available for the iPhone/iPad applications.

Versions 18 and later

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

Example

n is int
MyString is string = "What a wonderful World"
n = Position(MyString, "won", 1, FromBeginning)
// Returns 8 (position of "w" in "wonderful")
n = Position(MyString, "XXX")
// Returns 0 (no "XXX" found in the string)
n = Position(MyString, "l", 0, FromEnd)
// Returns 21 (position of "l" in "World")
n = Position(MyString, "e", 11)
// Returns 12 (position of "e" in "wonderful")
n = Position(MyString, "o", Length(MyString), FromEnd)
// Returns 19 (position of "o" in "World")
n = Position(MyString, "o", n-1, FromEnd)
// Returns 9 (position of "o" in "wonderful")
n = Position(MyString, "o", n-1, FromEnd)
// Returns 0 (there is no other "o")

n is int
MyString2 is string = "http://Server/File.html"
n = Position(MyString2,["/","//"])
// Returns 6
n = Position(MyString2,["/","//"], 8)
// Returns 15

Syntax

Finding a character string Hide the details

<Result> = Position(<Initial String> , <String to Find> [, <Start Position> [, <Option>]])

<Result>: Integer

Position of first character of character string sought in the initial string,
0 if the sought string is not found.
This position is given in relation to the beginning of string.

<Initial String>: Character string

Character string where the search will be performed (maximum size: 2 GB).

<String to Find>: Character string

Character string that must be found in the initial string.

<Start Position>: Optional integer

Subscript of character from which the search will be performed. By default, the search starts from the first character (character 1).
To perform a search from the end of the string (FromEnd constant), this parameter must correspond to 0 or to the size of the string.
If this parameter is negative, the search starts from the first character.
If this parameter is greater than the number of character found in <Initial String>, <Result> is equal to 0.

<Option>: Optional constant (or combination of constants)

Indicates the search direction and the characteristics of the search:
FromBeginning
(Default value) Search performed from the first character of the string to the last one
FromEnd Search performed from the last character of the string to the first one
WholeWord Search for the whole word, which means enclosed in punctuation characters or in space characters
This option has no effect.
IgnoreCase Search while ignoring the case (uppercase/lowercase) or the accented characters
This option has no effect.
This parameter is not available. The search is performed from the first character of the string to the last one. The search is case sensitive. The sought string does not necessarily correspond to a whole world: this string can be part of a word.

Versions 16 and later

This syntax is now available for the PHP sites.

New in version 16

This syntax is now available for the PHP sites.

This syntax is now available for the PHP sites.

Finding an array of character strings Hide the details

<Result> = Position(<Initial String> , <Array of Strings to Find> [, <Start Position> [, <Option>]])

<Result>: Integer

Position of the first character in the first character string of the array found in the initial string.
This position is given in relation to the beginning of string.
0 if none of the sought strings was found.

<Initial String>: Character string

Character string where the search will be performed (maximum size: 2 GB).

<Array of Strings to Find>: Array

Array containing the character strings to find in the initial string.

<Start Position>: Optional integer

Subscript of character from which the search will be performed. By default, the search starts from the first character (character 1). To perform a search from the end of the string, this parameter must correspond to 0 or to the size of the string.
If this parameter is negative, the search starts from the first character.
If this parameter is greater than the number of character found in <Initial String>, <Result> is equal to 0.

<Option>: Optional constant (or combination of constants)

Indicates the search direction and the characteristics of the search:
FromBeginning
(Default value) Search performed from the first character of the string to the last one
FromEnd Search performed from the last character of the string to the first one
WholeWord Search for the whole word, which means enclosed in punctuation characters or in space characters
This option has no effect.
IgnoreCase Search while ignoring the case (uppercase/lowercase) or the accented characters
This option has no effect.
This parameter is not available. The search is performed from the first character of the string to the last one. The search is case sensitive. The sought string does not necessarily correspond to a whole world: this string can be part of a word.

Remarks

Finding the character string

The search is case sensitive by default: the sought string and the string to find must have the same case. To perform a case-insensitive search, use the IgnoreCase parameter.

The positions in a character string are always given from the beginning of the string, regardless the search direction.

To associate Position with the FromEnd constant, you must start from the position calculated by Length(<Initial String>). For example:

Position(MyString, "\", Length(MyString), FromEnd)

The following syntax can also be used. In this case, the parameter 0 allows the function to select the best start position.

Position(MyString, "\", 0, FromEnd)

Unicode/Ansi

Position allows you to find the position of a string in a string in Unicode or Ansi format.

Strings in Ansi and/or Unicode format can be used in <Initial String> and <Sought String> (a parameter can be in Unicode format while the other one is in Ansi format).

The following conversion rule is used:

If at least one of the strings in in Unicode format, all the strings are converted to the Unicode format and the operation is performed in Unicode format.
Otherwise, the operation is performed in Ansi.

Characters taken into account for the punctuation and the spaces

The characters taken into account for the punctuation and the spaces are supplied by the system. To get the list of these characters, write the following WLanguage code:

s is string
FOR i = 0 TO 255
IF Charact(i) <> StringFormat(Charact(i), ccIgnorePunctuationAndSpace) THEN
s += Charact(i)
END
END
Info(s)
ToClipboard(s)

Various

PositionOccurrence is used to find out the position of Nth occurrence of sub-string by performing a search from the beginning of string or from the end of string.

Component : wd250vm.dll