Search and Replace String (G Dataflow)

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Last Modified: January 25, 2019

Replaces all instances of a substring with another substring.

multiline?

A Boolean value that determines whether to treat the text in the input string as a multiple-line string. This affects how the ^ and $ characters handle matches.

True	^ matches the beginning of any line in the input string. $ matches the end of any line in the input string.
False	^ matches only the beginning of the input string. $ matches only the end of the input string.

Default: False

ignore case

Boolean value that determines whether the string search is case sensitive.

True	The search ignores the letter case of the input.
False	The search matches the letter case of the input.

Default: False

replace all

A Boolean value that determines whether the node replaces all occurrences of the search string or only the first occurrence.

True	The search replaces all matches for the search string.
False	The search replaces only the first occurrence of a match.

Default: False

input string

The string this node searches.

search string

The string you want to replace if it exists in the input string.

Implications of Empty String

If search string is an empty string and replace all is False, the node inserts replace string at the beginning of input string. If search string is an empty string and replace all is True, the node inserts replace string at the beginning of input string, in between each character, and at the end.

replace string

The string used to replace search string in input string.

Default: Empty string

offset

The number of characters into the input string at which this node starts searching.

The offset of the first character in the input string is 0. If offset is beyond the end of the input string, this node returns an empty string.

Note

A character refers to a code point, a numeric unit between 0 and 10FFFF₁₆, defined by the Unicode standard for encoding. For more information about code points, research Unicode.

error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error

If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

result string

The input string with one or all occurrences of search string replaced with replace string.

If replace string is empty, result string contains input string with search string deleted.

number of replacements

Number of times this node replaced search string.

offset past replacement

The offset of the character immediately following where the last match and replacement occurred in the result string.

If the node does not find the search string, this output is -1.

If replace all is False, the next match, if any, is after this point.

Note

A character refers to a code point, a numeric unit between 0 and 10FFFF₁₆, defined by the Unicode standard for encoding. For more information about code points, research Unicode.

error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

error in does not contain an error	error in contains an error

If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Searching for Complex Patterns

If you want to search for complex patterns, like 5-character substrings ending with d, configure this node to search using regular expressions. Select Regular Expression in the Behavior section of the Item tab. This enables you to search for matches using regular expressions in the search string input.

You can also use the Match Regular Expression node instead, which uses the same regular expression syntax.

Reducing Performance Burden

Characters in UTF-8 can be multiple bytes so string nodes count the number of characters in a string instead of jumping to a point in memory. Since the length and offset parameters are in units of characters, avoid nesting this node with large strings because that can create exponential functions that carry a higher performance burden.

Where This Node Can Run:

Desktop OS: Windows

FPGA: All devices (only within an optimized FPGA VI)

Web Server: Not supported in VIs that run in a web application

Table Of Contents

multiline?

ignore case

replace all

input string

search string

replace string

offset

error in

result string

number of replacements

offset past replacement

error out

Searching for Complex Patterns

Reducing Performance Burden

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