Is regex case sensitive Java?

Discussion. Currently, REGEXP is not case sensitive , either. Both expressions are true because [:lower:] and [:upper:] are equivalent when case sensitivity doesn’t matter.

Java Regular Expressions are case-sensitive by default .

REGEXP is not case sensitive, except when used with binary strings .

Using character sets For example, the regular expression “[ A-Za-z] ” specifies to match any single uppercase or lowercase letter . In the character set, a hyphen indicates a range of characters, for example [A-Z] will match any one capital letter.

In Java, by default, the regular expression (regex) matching is case sensitive. To enable the regex case insensitive matching, add (?) prefix or enable the case insensitive flag directly in the Pattern .