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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: Because ramine plugging comp.programming with spam....
Date: Wed, 27 Nov 2019 18:31:28 -0500
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On 11/27/2019 8:32 AM, chad altenburg wrote:
> This is sort of Java related.
> 
> This is about searching for a word in a Java using regex.
> 
> I have the word "AlarmService".
> 
> 1)searching for "alarm" produces "AlarmService"
> 
> 2)searching for "alarmS" produces nothing
> 
> 3)searching for "AlarmS" produces "AlarmService"
> 
> The question is how come having a lowercase in "a" in 1 produces the entire word
> while the lowercase "a" in 2 doesn't? Ie, I have to change it uppercase in order to get the correct result.

Could you show some code?

Because I cannot recreate the problem.

import java.util.regex.Pattern;

public class RegexMatch {
	public static void test(String needle, String haystack) {
		Pattern p = Pattern.compile(needle);
		System.out.printf("Standard match %s in %s : %b\n", needle, haystack, 
p.matcher(haystack).find());
		Pattern pi = Pattern.compile(needle, Pattern.CASE_INSENSITIVE);
		System.out.printf("Case insensitive match %s in %s : %b\n", needle, 
haystack, pi.matcher(haystack).find());
	}
	public static void main(String[] args) {
		test("alarm", "AlarmService");
		test("alarmS", "AlarmService");
		test("AlarmS", "AlarmService");
	}
}

produces:

Standard match alarm in AlarmService : false
Case insensitive match alarm in AlarmService : true
Standard match alarmS in AlarmService : false
Case insensitive match alarmS in AlarmService : true
Standard match AlarmS in AlarmService : true
Case insensitive match AlarmS in AlarmService : true

which matches my expectations.

Arne