Reg ex and not match

[sks]

I'm a bit stuck on how to not match something in a reg ex,

Ie, if I wanted to test that a string did not begin with ABC

Do I have to use a character class and do something like this
[^(ABC)]

???

 

[hiwa]

sks ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸:

I'm a bit stuck on how to not match something in a reg ex,

Ie, if I wanted to test that a string did not begin with ABC

Do I have to use a character class and do something like this
[^(ABC)]

???

Basically and generally, regular expression can't do it.
But your Java program that utilizes regex could do.

 

[Jeffrey Schwab]

I'm a bit stuck on how to not match something in a reg ex,

Ie, if I wanted to test that a string did not begin with ABC

Do I have to use a character class and do something like this
[^(ABC)]

No. The character-class will match one character that is none of A, B,
C, or either parenthesis. Try this:

Pattern.compile("^(?!ABC)");

 

[Oliver Wong]

I'm a bit stuck on how to not match something in a reg ex,

Ie, if I wanted to test that a string did not begin with ABC

Do I have to use a character class and do something like this
[^(ABC)]

???

Your regular expression would basically say this (in plain English):

( String does NOT start with A. )
OR
( String starts with A, but does NOT have a B following it)
OR
( String starts with AB, but does not have a C following it)

I'm not familiar with Java's specific syntax for regular expressions,
but it'd probably look something like:

([^A])|(A[^B])|(AB[^C])

possibly with the addition of "string start" and "string end" markers.

- Oliver