default

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.

Here's an example of calling this function from Kotlin code:

val regex: EmailAddressRegex = EmailAddressRegex.default()
val expected = """^\S+@\S+\.\S+$"""
assertEquals(expected, "$regex")

The Java method generated from this function is named defaultPattern, due to the default keyword present in this programming language.

Here's an example of calling this function from Java code:

final EmailAddressRegex regex = EmailAddressRegex.defaultPattern();
final String pattern = regex.toString();
final String expected = "^\\S+@\\S+\\.\\S+$";
Assertions.assertEquals(expected, pattern);