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Function Reference
1010data Insights Platform offers a rich set of functions that may be used in value expressions when creating computed columns and in selection expressions when performing row selections.
String functions
String functions are vector functions that manipulate vectors of strings to provide information about a string or substring, concatenate and split strings, or transform strings based on specified criteria.
Position
strextract(X;P;N)
Returns the specified number of characters, starting at a certain position, extracted from a given string.

Function Reference
1010data Insights Platform offers a rich set of functions that may be used in value expressions when creating computed columns and in selection expressions when performing row selections.
- All 1010data Functions
  1010data provides a whole range of functions that can provide information and act on your data.
- Time/Date functions
  The time/date functions are vector functions that operate on columns containing time-related data and return specific information about the date/time for each row.
- Group functions (g_functions)
  Group functions, or g_functions, are used to perform operations, such as summarizations, on rows that have the same values in a set of given columns.
- Math functions
  Math functions are vector functions that perform mathematical operations on one or more columns and return a column of results based on the operation.
- Matrix functions
- Categorization functions
  Categorization functions are vector functions that organize data and determine logical groupings. These functions can be used for conditionalizing results and/or bucketing value ranges.
- String functions
  String functions are vector functions that manipulate vectors of strings to provide information about a string or substring, concatenate and split strings, or transform strings based on specified criteria.
  - Length
  - Position
    - stredit(X;P;N;Y)
      Returns a given string, with a specified number of characters starting at a certain position replaced by a given substring.
    - strextract(X;P;N)
      Returns the specified number of characters, starting at a certain position, extracted from a given string.
    - strfind(X;Y;I)
      Returns the position within a given string of a particular occurrence of a given substring.
    - strlcspos(X;Y)
      Returns the position in the second string of the longest contiguous substring that appears in both given strings.
    - strpick(X;Y;I)
      Returns the character at a particular position, or the element delimited by a particular value, within a given string.
    - strspan(X;Y;C;D)
      Returns the position of the first (or last) character in a given string that is found (or not found) in another string.
    - strsplit(X;Y;I)
      Returns the character at a particular position, or the substring delimited by a particular value, within a given string.
    - strsplitpos(X;Y;I)
      Returns the position of a certain element delimited by a particular value within a given string.
  - Case
  - Substrings
  - Concatenation
  - Comparison
  - Transformations
  - Regular expressions
- List functions
  List functions are scalar functions that return lists, subsets of lists, and combinations of lists, among other functionality. Lists, along with packages, are compound scalar data types that facilitate programmatic interaction with scalar data values and variables.
- Data-handling functions
  Data-handling functions are vector functions that return a hash value based on an input column or columns.
- Row functions
  Row functions are vector functions that return computational outputs for row inputs, as opposed to column outputs. Row inputs are defined as a space- or comma-separated list of column names.
- SQL compatibility functions
  SQL compatibility functions are functions that treat null values as SQL nulls.
- Financial functions
- System functions
  System functions are special functions in 1010data that return information about users, tables, and other system objects.
- Object functions
  The object functions can be used to check the existence, type, and accessibility of objects such as folders, tables, and queries on the 1010data Insights Platform.
- Miscellaneous functions
  This category of functions contains special functions that don't neatly fit into other categories of functions.

`strextract(X;P;N)`

Returns the specified number of characters, starting at a certain position, extracted from a given string.

Syntax

strextract(X;P;N)
bstrextract(X;P;N)

Input

Argument Type Description

X

text

The string on which to apply the function

A scalar value or the name of a column

P

integer

An index corresponding to a particular position in X

The index P is 1-based (i.e., the first character has position 1).

A negative position counts back from the end of the string (i.e., P=-1 refers to the last character).

N

integer

The number of characters to extract from X

N=-1 refers to as many characters as necessary to reach the end of the string.

If N is N/A, it is treated as -1.

Return Value

Returns the text value consisting of N characters beginning at position P extracted from the string X.

If X or P is N/A, the result is N/A.

Sample Usage


`value`	`position`	`number`	`strextract(value;position;number)`
'testing'	2	3	'est'
'testing'	-5	-1	'sting'

Additional Information

strextract is Unicode (UTF-8) compliant and will work with Unicode or plain ASCII text fields.
If passed a string argument that is not legal Unicode, it will by default signal an error (configurable as a user preference).
A corresponding function bstrextract can be used with non-Unicode strings (e.g., binary or legacy encodings).