在Perl中使用Regex查找空字符

Question

I want to find the null characters in an array, which I have. I tried displaying the ASCII value and it printed 0 (So I am confirmed it is a null value). How do I write a regex to filter out those values.

I wrote :

m/^$/ig 

which really didn't help me. Does anybody know how to match a null character ?

Answer 1

You can use \\x followed by the hex code of an ASCII character to match that ASCII character.

Eg /\\x3F/ will match a "?", /\\x46\\x4F\\x4F/ to match "FOO".

See it here on Regexr

So /\\x00/ would match the NULL character.

Answer 2

you can use \\0 to find null character. (but do not follow this with another digit)

Answer 3

0x0 should do the trick.

0x[0-9A-F] to find any hex char