Replace string by regex with specific value

Question

I have a substring like {[variable_name]} and want to replace it with the value of the variable specified in brackets.

/\{\[\s*[^0-9][a-zA-Z0-9_]*\s*]}/

This is my regular expression, but I have no idea, what i should do next. How do I?

Take a look at preg_replace_callback(). Also since you then need access to dynamic variable names in the callback you will need to use global with variable variables. — Rizier123
– Rizier123, Commented May 1, 2016 at 18:13
@Jan OP won't be able to use use(). Think about it: OP will get the value of the variable name in the matches array, which gets passed to the callback. So he can't use it in use(). — Rizier123
– Rizier123, Commented May 1, 2016 at 18:15
@Rizier123: See my answer with using use in the callback function. — Jan
– Jan, Commented May 1, 2016 at 18:20

Jan · Accepted Answer · 2016-05-01 18:19:58Z

1

In addition to the comment, this would work:

<?php
$replacements = array();
$replacements["var1"] = "New variable here";
$regex = '~\{\[([^]]+)\]}~';

$string = "This is some string with {[var1]} in it";
$string = preg_replace_callback(
    $regex,
    function ($match) use ($replacements) {
        return $replacements[$match[1]];
    },
    $string);
echo $string;
# This is some string with New variable here in it
?>

See a demo on ideone.com.

answered May 1, 2016 at 18:19

Jan

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