Regex Value for Java Case Insensitive

Question

I wrote one regular expression for catching any special characters in the text.

regular expression: (?i)[$&+,:;=?@#|'<>.-^*()%!]

I am passing a text "Testing" but getting output that the text contains special characters. But as soon as i pass, "testing" with small "t", i am getting no error.. Can you please help ?

code:

String REGEX = "(?i)[$&+,:;=?@#|'<>.-^*()%!]";
String fieldValue="Testing";
java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(REGEX);
java.util.regex.Matcher matcher = pattern.matcher(fieldValue);
if (matcher.find()) {
    String strWarningMessage = "Field value cannot contain Special Characters";
    System.out.println(strWarningMessage);
}
else
    System.out.println("OK");

I've edited the parenthesis in your if, I hope it was a typo only when you posted the question. Isn't it? — Maroun
– Maroun, Commented Oct 29, 2014 at 6:57
I don't think you should be getting an error. What's the message? — Maroun
– Maroun, Commented Oct 29, 2014 at 7:15
It's not an error message, it prints my warning message only: Field value cannot contain Special Characters — Rebooting
– Rebooting, Commented Oct 29, 2014 at 7:15

nhahtdh · Accepted Answer · 2014-10-29 07:18:23Z

1

Move your - to the end of the character class or escape it:

"[$&+,:;=?@#|'<>.^*()%!-]"

And the (?i) can be dropped, since your pattern doesn't specify any character which has different cases.

In your original regex, .-^ is specifying a range of character from . (U+002E) to ^ (U+005E), which contains uppercase A-Z and digits 0-9.

answered Oct 29, 2014 at 7:18

nhahtdh

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2 Comments

Maroun Over a year ago

Shouldn't have ^? OP doesn't want to match any special character.

nhahtdh Over a year ago

@MarounMaroun: Don't know. There are numerous other "special character" in Unicode.

Sergii Lagutin · Accepted Answer · 2014-10-29 07:19:26Z

1

Your problem is character -. When symbol group [...] contains this character, there are two possible interpretation:

symbol - (when it placed in first position after [)
symbol range (when it placed in any position after [ except first)

So you need move - to start of symbol group.

answered Oct 29, 2014 at 7:19

Sergii Lagutin

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