How to replace every invalid character in a string with a different one in PHP?

Asked Mar 21 '21 at 20:16

Active Mar 21 '21 at 20:16

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I'm trying to replace invalid characters in a string by a '_' I tried using preg_replace like this

preg_replace('/[^a-zA-Z]+/', '_', $value);

but if my string was 'value1234' it's converted to 'value_' What I need is every single invalid character to be replaced by a '' which would return 'value___' I need to apply this with a complex regex so I want to avoid looping and testing each character if possible. Any idea on how to do this?

asked Mar 21 '21 at 20:16

user1026605

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Then remove `+`, use `preg_replace('/[^a-zA-Z]/', '_', $value);`. What complex regex do you mean? – Wiktor Stribiżew Mar 21 '21 at 20:17
It was definetly time for a coffee break... Thanks for pointing at the issue. Please add this as an answer so I can confirm your answer. Thanks – user1026605 Mar 22 '21 at 00:47

How to replace every invalid character in a string with a different one in PHP?

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