A blog for Power Automate expressions & the Power Platform.

Format a timestamp or date in a specific pattern.

formatDateTime(utcNow(), 'yyyy-MM-dd HH:mm')

Generate a globally unique identifier (GUID).

guid()

Return one value if a condition is true, another if false.

if(equals(variables('env'),'prod'),'Strict','Relaxed')

Join array values into a single string with a separator.

join(variables('items'), ', ')

Count characters in a string or items in an array.

if(greater(length(variables('arr')),0),'has items','empty')

Description

Example

Replace occurrences of text inside a string.

replace(toLower(variables('text')), 'old', 'new')

Split a string into an array using a delimiter.

split('a,b,c', ',')

Check whether text starts with a specified substring.

startsWith(toLower(variables('name')), 'abc')

Extract a substring by start index and length.

substring(variables('text'), 0, 10)

Convert text to lowercase for case-insensitive comparisons.

toLower(variables('text'))

Access trigger data or headers from the flow trigger event.

triggerOutputs()?.headers?['x-ms-client-user']