expression to format a value

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Posted on by drossi90

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Hi there,

I have a flow that captures a user input, the expected input is "LH" and then some digits. For example, LH12345 or LH123456.

I have a flow that consumes this user input, but sometimes the user inputs just the digits, an example: "12345" or "123456".
Or, sometimes users include a space, LH 12345 etc. This causes my flow to fail, as it is expecting it to start with "LH" and for there to be no spaces.

How would I write an expression that checks if: 1. If it does not start with LH, then add that in and or, remove any spaces?

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Building flows

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Chriddle 8,591 Super User 2026 Season 1 on at

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Here outputs('Compose') is the number to check. If your number is already a string you can remove the string function.
Note that "LH" is case-sensitive here:
replace( if( equals( substring(string(outputs('Compose')), 0, 2), 'LH'), outputs('Compose'), concat('LH', string(outputs('Compose')) ) ), ' ', '' )

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drossi90 188 on at

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Thanks @Chriddle , that looks good.

And if it's "lh", how would we overcome that to not be case-sensitive?

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Chriddle 8,591 Super User 2026 Season 1 on at

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Use toUpper() before comparison:
replace( if( equals( substring(toUpper(string(outputs('Compose'))),0,2), 'LH' ), toUpper(outputs('Compose')), concat('LH', string(outputs('Compose'))) ), ' ', '' )

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