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 .
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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.
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By default, the comparison of an input string with any literal characters in a regular expression pattern is case sensitive , white space in a regular expression pattern is interpreted as literal white-space characters, and capturing groups in a regular expression are named implicitly as well as explicitly.
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In computers, case sensitivity defines whether uppercase and lowercase letters are treated as distinct (case-sensitive) or equivalent (case-insensitive) . For instance, when users interested in learning about dogs search an e-book, “dog” and “Dog” are of the same significance to them.
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Java String equalsIgnoreCase() Method The equalsIgnoreCase() method compares two strings, ignoring lower case and upper case differences. This method returns true if the strings are equal, and false if not. Tip: Use the compareToIgnoreCase() method to compare two strings lexicographically, ignoring case differences.
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case insensitive (not comparable) (computer science) Treating or interpreting upper- and lowercase letters as being the same .
Read moreHow do you know if a case is insensitive?
Comparing strings in a case insensitive manner means to compare them without taking care of the uppercase and lowercase letters. To perform this operation the most preferred method is to use either toUpperCase() or toLowerCase() function .
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