regex match any number
For matching an integer number of one single char/digit, specify:
[0-9]
But for matching any number of more than one char/digit; add "+":
[0-9]+
Example for matching hour with minutes of HH:MM format in a file:
grep "[0-9]+:[0-9]+" file.txtregular expressions password contains number
"^(?=.*[A-Za-z])(?=.*d)[A-Za-zd]{8,}$"Copyright © 2021 Codeinu
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