PATTERN
The pattern that an email address should match.
The underlying value is ^\S+@\S+\.\S+$
.
Here's the explanation associated to each symbol used in this pattern:
^
Beginning. Matches the beginning of the string, or the beginning of a line if the multiline flag (m) is enabled.\S
Not whitespace. Matches any character that is not a whitespace character (spaces, tabs, line breaks).+
Quantifier. Match 1 or more of the preceding token.@
Character. Match a "@" character (char code 64).\.
Escaped character. Matches a "." character (char code 46).$
End. Matches the end of the string, or the end of a line if the multiline flag (m) is enabled.
Calling from Kotlin
Here's an example of calling this property from Kotlin code:
val actual: String = EmailAddress.PATTERN
val expected = "^\\S+@\\S+\\.\\S+\$"
assertEquals(expected, actual)
Calling from Java
Here's an example of calling this property from Java code:
final String actual = EmailAddress.PATTERN;
final String expected = "^\\S+@\\S+\\.\\S+$";
Assertions.assertEquals(expected, actual);