The unique identifier which serves as the virtual location of cryptocurrency. The Bitcoin address is an identifier of 26-35 alphanumeric characters, beginning with the number 1, 3 or bc1.
0, O, I, l are removed to avoid visual ambiguity.
There are currently three address formats in use:
1.P2PKH which begin with the number 1
1BvBMSEYstWetqTFn5Au4m4GFg7xJaNVN2
2.P2SH type starting with the number 3
3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy
3.Bech32 type starting with bc1
bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq
The length of the bitcoin address is validated. After which, it is checked for digits, lowercase or uppercase characters. The prefix is also checked later. It must also be made sure to pass the text which contains only the bitcoin address (^ and $ makes sure of this).