9 String functions

All functions listed here are supported in:

• Trigger expressions
• Calculated items

The functions are listed without additional information. Click on the function to see the full details.

Function details

Some general notes on function parameters:

• Function parameters are separated by a comma
• Expressions are accepted as parameters
• String parameters must be double-quoted; otherwise they might get misinterpreted
• Optional function parameters (or parameter parts) are indicated by < >

ascii(value)

The ASCII code of the leftmost character of the value.
Supported value types: String, Text, Log.

Parameter:

• value - the value to check

For example, a value like 'Abc' will return '65' (ASCII code for 'A').

Example:

ascii(last(/host/key))

bitlength(value)

The length of value in bits.
Supported value types: String, Text, Log, Integer.

Parameter:

• value - the value to check

Example:

bitlength(last(/host/key))

bytelength(value)

The length of value in bytes.
Supported value types: String, Text, Log, Integer.

Parameter:

• value - the value to check

Example:

bytelength(last(/host/key))

char(value)

Return the character by interpreting the value as ASCII code.
Supported value types: Integer.

Parameter:

• value - the value to check

The value must be in the 0-255 range. For example, a value like '65' (interpreted as ASCII code) will return 'A'.

Example:

char(last(/host/key))

concat(<value1>,<value2>,...)

The string resulting from concatenating the referenced item values or constant values.
Supported value types: String, Text, Log, Float, Integer.

Parameter:

• valueX - the value returned by one of the history functions or a constant value (string, integer, or float number). Must contain at least two parameters.

For example, a value like 'Zab' concatenated to 'bix' (the constant string) will return 'Zabbix'.

Examples:

concat(last(/host/key),"bix")
       concat("1 min: ",last(/host/system.cpu.load[all,avg1]),", 15 min: ",last(/host/system.cpu.load[all,avg15]))

insert(value,start,length,replacement)

Insert specified characters or spaces into the character string beginning at the specified position in the string.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• start - start position;
  
• length - positions to replace;
  
• replacement - replacement string.

For example, a value like 'Zabbbix' will be replaced by 'Zabbix' if 'bb' (starting position 3, positions to replace 2) is replaced by 'b'.

Example:

insert(last(/host/key),3,2,"b")

jsonpath(value,path,<default>)

Return the JSONPath result.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• path - the path (must be quoted);
  
• default - the optional fallback value if the JSONPath query returns no data. Note that on other errors failure is returned (e.g. "unsupported construct").

Example:

jsonpath(last(/host/proc.get[zabbix_agentd,,,summary]),"$..size")

left(value,count)

Return the leftmost characters of the value.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• count - the number of characters to return.

For example, you may return 'Zab' from 'Zabbix' by specifying 3 leftmost characters to return. See also right().

Example:

left(last(/host/key),3) #return three leftmost characters

length(value)

The length of value in characters.
Supported value types: String, Text, Log.

Parameter:

• value - the value to check.

Examples:

length(last(/host/key)) #the length of the latest value
       length(last(/host/key,#3)) #the length of the third most recent value
       length(last(/host/key,#1:now-1d)) #the length of the most recent value one day ago

ltrim(value,<chars>)

Remove specified characters from the beginning of string.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• chars (optional) - specify the characters to remove.

Whitespace is left-trimmed by default (if no optional characters are specified). See also: rtrim(), trim().

Examples:

ltrim(last(/host/key)) #remove whitespace from the beginning of string
       ltrim(last(/host/key),"Z") #remove any 'Z' from the beginning of string
       ltrim(last(/host/key)," Z") #remove any space and 'Z' from the beginning of string

mid(value,start,length)

Return a substring of N characters beginning at the character position specified by 'start'.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• start - start position of the substring;
  
• length - positions to return in substring.

For example, it is possible return 'abbi' from a value like 'Zabbix' if starting position is 2, and positions to return is 4.

Example:

mid(last(/host/key),2,4)="abbi"

repeat(value,count)

Repeat a string.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• count - the number of times to repeat.

Example:

repeat(last(/host/key),2) #repeat the value two times

replace(value,pattern,replacement)

Find the pattern in the value and replace with replacement. All occurrences of the pattern will be replaced.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• pattern - the pattern to find;
  
• replacement - the string to replace the pattern with.

Example:

replace(last(/host/key),"ibb","abb") #replace all 'ibb' with 'abb'

right(value,count)

Return the rightmost characters of the value.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• count - the number of characters to return.

For example, you may return 'bix' from 'Zabbix' by specifying 3 rightmost characters to return. See also left().

Example:

right(last(/host/key),3) #return three rightmost characters

rtrim(value,<chars>)

Remove specified characters from the end of string.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• chars (optional) - specify the characters to remove.

Whitespace is right-trimmed by default (if no optional characters are specified). See also: ltrim(), trim().

Examples:

rtrim(last(/host/key)) #remove whitespace from the end of string
       rtrim(last(/host/key),"x") #remove any 'x' from the end of string
       rtrim(last(/host/key),"x ") #remove any 'x' and space from the end of string

trim(value,<chars>)

Remove specified characters from the beginning and end of string.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• chars (optional) - specify the characters to remove.

Whitespace is trimmed from both sides by default (if no optional characters are specified). See also: ltrim(), rtrim().

Examples:

trim(last(/host/key)) #remove whitespace from the beginning and end of string
       trim(last(/host/key),"_") #remove '_' from the beginning and end of string

xmlxpath(value,path,<default>)

Return the XML XPath result.
Supported value types: String, Text, Log.

Parameters:

• value - the value to check;
  
• path - the path (must be quoted);
  
• default - the optional fallback value if the XML XPath query returns an empty nodeset. It will not be returned if the empty result is not a nodeset (i.e., empty string). On other errors failure is returned (e.g. "invalid expression").

Example:

xmlxpath(last(/host/xml_result),"/response/error/status")

See all supported functions.