How to remove all non printable characters in a string and keep some?

Question

I'm using this

$string = preg_replace('/[\x00-\x1F\x7F\xA0]/u', '', $string);

That regex is from this link PHP: How to remove all non printable characters in a string?

The regex is removing \n but I would like to keep it. What should I do?

I think \n is 000A, so I've tried something like this (it will make all the regex stoping working) $string = preg_replace('/[\x00-\x1F\x7F\xA0[ˆ\x0A]]/u', '', $string);

I appreciate any help.

score 1 · Accepted Answer · answered Feb 01 '18 at 08:15

1

The range \x00-\x1F contains \x0A.

You have to split this range.

$string = preg_replace('/[\x00-\x09\x0B-\x1F\x7F\xA0]/u', '', $string);

answered Feb 01 '18 at 08:15

Syscall

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score 1 · Answer 2 · answered Feb 01 '18 at 08:20

1

try this

[\x00-\x1F\x7F\xA0[^\x0A^\x0d]]

Explanation:

x0A - line feed (\n)

x0d - carriage return (\r)

Example:

https://regexr.com/3k3bm

answered Feb 01 '18 at 08:20

bob

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score 1 · Answer 3 · answered Feb 01 '18 at 12:06

1

Minimal change to the original regex:

/(?!\n|\r)[\x00-\x1F\x7F-\xFF]/u

Uses a negative lookahead to not match line feeds and carriage returns.

answered Feb 01 '18 at 12:06

KyleFairns

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How to remove all non printable characters in a string and keep some?

3 Answers3