Extract number from email subject

[Jamy123]

Sorry if this has been posted previously.

I have a flow which is triggered by an email being received - exports email - converts to pdf- renames and then pushes to a drobox folder - this is all working successfully.

BUT I now need a condition that reads the subject line and looks for a 9 digit number - a customer might put this anywhere in the subject line, and then uses this number to name the exported email - the number will always begin with a 1 - can you suggest anything?

Thanks in advance 

[Mira_Ghaly · Accepted solution]

@Jamy123 

Please try below expression, Replace outputs('Subject') with the subject from your email

substring(outputs('Subject'),indexOf(outputs('Subject'),'1'),9)