validation Special character using Regular Expressions

[skumar nand]

Hi All,

we are try to Special character using Regular Expressions but \ (backslash) not validating using below code

  
Pattern pattern = Pattern.compile("[/,:<>!~@#$%^&()+=?()\"|!\\[#$-]");
Matcher patternMatcher = pattern.matcher(field.subSequence(0,field.length()));
if(patternMatcher.find()==true){
	msg = specCharError(fieldName,line);
}
  

please help us to validate Special character including \ (backslash) .

Thanks in advance.

[Henry Wong]

The backslash has special meaning to a regex AND to a java string. So, if you want the regex to not treat the backslash as special, and you want to use a string literal, then you need to escape twice.... giving you four backslashes.

Henry

[skumar nand]

can you update the below Regular Expressions

Pattern pattern = Pattern.compile("[/,:<>!~@#$%^&()+=?()\"|!\\[#$-]");

[skumar nand]

Hi Henry,

Am not understand what ever you say.

can you provide me a example or change my Expressions according you.

[Rob Spoor]

Henry Wong wrote:giving you four backslashes.

Henry already gave you the answer.