Android: Accept all special characters in regex

Question

I'm validating the Edittext with regex by allowing particular characters in that i need to allow all the special characters to enter in edit text.

for allowing alpha and numbers im using the code

edittext.setFilters(new InputFilter[] { new PartialRegexInputFilter(
                    "[a-zA-z0-9]+") });

Like this i need to allow all special characters...

And also i try to give like this

edittext.setFilters(
new InputFilter[] 
    { new PartialRegexInputFilter(
        "[A-Za-z0-9!#$%&(){|}~:;<=>?@*+,./^_`-\'\" \t\r\n\f]+") 
    }
);` .

But this give error for single and double quote characters...

You know how to do it for alphanumeric characters. Now just negate that to get all other characters. If this does not works, then add a definition of Special Characters to your question. — Rohit Jain
– Rohit Jain, Commented Dec 26, 2012 at 11:38
it will change according to user define in front end... Sometime they will define only to type number with special characters.. — Siva
– Siva, Commented Dec 26, 2012 at 11:40
And also i try to give like this [A-Za-z0-9!#$%&(){|}~:;<=>?@*+,./^_`-\'\" \t\r\n\f]. But this give error for single and double quote characters... — Siva
– Siva, Commented Dec 26, 2012 at 11:42

asteri · Accepted Answer · 2012-12-26 15:02:47Z

2

Is there anything you want to disallow? It sounds like you're trying to allow all alphanumeric character and allow all non-alphanumeric (i.e., special) characters.

The following regex will match all special characters:

[^A-Za-z0-9]

answered Dec 26, 2012 at 15:02

asteri

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Chris · Accepted Answer · 2018-07-10 20:43:09Z

2

Instead of adding every special character, use .*. This regex matches everything.

If you want to remove some characters from it, use [^a!c] alone, without .*, to match everything except a, ! and c.

answered Jul 10, 2018 at 20:43

Chris

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Shar1er80 · Accepted Answer · 2018-07-10 20:11:25Z

1

I think the problem with your second pattern is the hyphen (-) in the middle of your character set. Move it to the end:

[A-Za-z0-9!#$%&(){|}~:;<=>?@*+,./^_`\'\" \t\r\n\f-]+

Hyphens cannot be in the middle because they specify ranges of characters [a-z] specifies all lowercase letters between a through z.

answered Jul 10, 2018 at 20:11

Shar1er80

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