Java regex case insensitivity not working

Question

I\'m trying to remove some words in a string using regex using below program. Its removing properly but its considering only case sensitive. How to make it as case insensiti

Answer 1

You need to place the (?i) before the part of the pattern that you want to make case insensitive:

System.out.print(sample.replaceAll("(?i)\\b(?:is|the|in|any)\\b"," "));
                                    ^^^^

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I've replaced spaces around the keywords to be removed with word boundary (\\b). The problem comes because there may be two keywords one after another separated by just one space.

If you want to delete the keywords only if they are surrounded by space, then you can use positive lookahead and lookbehind as:

(?i)(?<= )(is|the|in|any)(?= )

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