In this article, we will learn how to make Java Regular Expression case-insensitive in Java. Java Regular Expression is used to find, match, and extract data from character sequences. Java Regular Expressions are case-sensitive by default. But with the help of Regular Expression, we can make the Java Regular Expression case-insensitive. There are two ways to make Regular Expression case-insensitive:
- Using CASE_INSENSITIVE flag
- Using modifier
1. Using CASE_INSENSITIVE flag: The compile method of the Pattern class takes the CASE_INSENSITIVE flag along with the pattern to make the Expression case-insensitive. Below is the implementation:
2. Using modifier: The ” ?i “ modifier used to make a Java Regular Expression case-insensitive. So to make the Java Regular Expression case-insensitive we pass the pattern along with the ” ?i ” modifier that makes it case-insensitive. Below is the implementation:
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