replace unknown characters between two known characters in php

Question

I have the following:

$string="rgb(Unknown characters) some text rgb(Unknown characters)";

I want to replace the the text Unknown characters with some replacement. I have tried this:

echo str_replace("Unknown characters","some replace characters",$string);

This works for an exact text match but I don't know what is inside the parentheses.

I would like the output to be

rgb(some replace characters) some text rgb(some replace characters)

Please help me.

What is `$echo` ???!!! It must be `echo` I think issue is `$echo` only, your code is working https://3v4l.org/NHdWU — B. Desai, Aug 26 '17 at 12:24
rgb(some replace characters) some text rgb(some replace characters) final Output — Banoth Shiva, Aug 26 '17 at 12:24
Start here: http://www.regular-expressions.info/tutorial.html — salathe, Aug 26 '17 at 12:25
Could you please confirm in your question that you need to replace whatever text is inside the brackets () — twoleggedhorse, Aug 26 '17 at 12:37

Toto · Answer 1 · 2017-08-26T12:34:17.230

2

Use preg_replace with a regex:

$string="rgb(Unkown characters) some text rgb(Unkown characters)";
echo preg_replace("/\([^)]+\)/","(some replace characters)",$string);

Output:

rgb(some replace characters) some text rgb(some replace characters)

Regex:

/         : regex delimiter
  \(      : open parenthesis
  [^)]+   : 1 or more any character that is not close parenthesis
  \)      : close parenthesis
/         : regex delimiter

edited Aug 26 '17 at 12:34

answered Aug 26 '17 at 12:27

Toto

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A bit more explanation of the regex used would be useful as the OP has clearly not used them before – twoleggedhorse Aug 26 '17 at 12:30

replace unknown characters between two known characters in php

1 Answers1