ignore case regex

Question

How do I ignore case for my match? I am trying to match:

public static void main(String[] args) {
    Pattern pattern = Pattern.compile("(?i)^concat\\(",Pattern.MULTILINE);
    Matcher matcher = pattern.matcher("CONCAT(trade,ca)");
    System.out.println(matcher.find());
}

Possible scenarios

CONCAT( = true
concat( = true
CONCAT(test = true
concat(test = true
concat = false
CONCAT = false
TESTCONCAT( = false

Possible duplicate of [Regex: ignore case sensitivity](https://stackoverflow.com/questions/9655164/regex-ignore-case-sensitivity) — Ken White, Apr 17 '19 at 02:35

score 2 · Accepted Answer · answered Apr 17 '19 at 13:13

2

Pattern has the flag CASE_INSENSITIVE so all you need is

 Pattern pattern = Pattern.compile("^concat\\(",Pattern.MULTILINE+Pattern.CASE_INSENSITIVE);

answered Apr 17 '19 at 13:13

Sascha

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16

The literal flag OP uses is fine too. But I agree flags in the factory method might make the pattern itself a little more readable. – Mena Apr 17 '19 at 13:16

ignore case regex

1 Answers1