One regex, multiple replacements [duplicate]

Question

OK, that's what I need :

Get all entries formatted like %%something%%, as given by the regex /%%([A-Za-z0-9\-]+)%%/i
Replace all instances with values from a table, given the index something.

E.g.

Replace %%something%% with $mytable['something'], etc.

If it was a regular replacement, I would definitely go for preg_replace, or even create an array of possible replacements... But what if I want to make it a bit more flexible...

Ideally, I'd want something like preg_replace($regex, $mytable["$1"], $str);, but obviously it doesn't look ok...

How should I go about this?

Though I am not a PHP guy, but you may try adding global hook g in your regex, e.g. /%%([A-Za-z0-9\-]+)%%/gi — Harsh Gupta
– Harsh Gupta, Commented May 17, 2013 at 9:40
@Dr.Kameleon: No need really. If you want to give credit, just upvote on that other question. Cheers! — Jon
– Jon, Commented May 17, 2013 at 9:42
If you use the [A-Za-z0-9-] class, you don't need to put the i modifier — Casimir et Hippolyte
– Casimir et Hippolyte, Commented May 17, 2013 at 9:46

mpyw · Accepted Answer · 2013-05-17 10:27:29Z

2

Code:

<?php

$myTable = array(
    'one' => '1!',
    'two' => '2!',
);

$str = '%%one%% %%two%% %%three%%';

$str = preg_replace_callback(
    '@%%(.*?)%%@',
    function ($matches) use ($myTable) {
        if (isset($myTable[$matches[1]]))
            return $myTable[$matches[1]];
        else
            return $matches[0];
    },
    $str
);

echo $str;

Result:

1! 2! %%three%%

if you don't want to tell upper from lower,

<?php

$myTable = array(
    'onE' => '1!',
    'Two' => '2!',
);

$str = '%%oNe%% %%twO%% %%three%%';

$str = preg_replace_callback(
    '@%%(.*?)%%@',
    function ($matches) use ($myTable) {
        $flipped = array_flip($myTable);
        foreach ($flipped as $v => $k) {
            if (!strcasecmp($k, $matches[1]))
                return $v;
        }
        return $matches[1];
    },
    $str
);

echo $str;

edited May 17, 2013 at 10:27

answered May 17, 2013 at 10:18

mpyw

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