Templates, variables processing with regexp in php

Question

I have multi-line string with some variables like $Item_#1_Value$ , $Item_#2_Value$ , and so on. I would like to replace (case in-sensitive) all these instances with real values, which is not a problem with str_ireplace().

The problem is I need to remove also all spaces which may (or may not) be adjacent to these variables. The other spaces, not adjacent to variables, I need to not touch.

For example: If $item_#1_Value$ is 1234, so strings: ABC$item_#1_Value$QWERT, ABC $ITEM_#1_VALUE$ QWERT, ABC $item_#1_Value$ QWERT all needs to be replaced to ABC1234QWERT.

I have understood it should be preg_replace(...) used instead of str_ireplace(...), but I cannot realize what regexp pattern should I use.

ishegg · Accepted Answer · 2018-03-13 02:54:43Z

1

One way to do it with regular expressions would be to match your tag with optional surrounding multiple whitespace:

\s*\$item_#1_Value\$\s*

Demo

PHP Code

<?php
$strings[] = 'ABC$item_#1_Value$QWERT';
$strings[] = 'ABC $ITEM_#1_VALUE$ QWERT';
$strings[] = 'ABC $item_#1_Value$ QWERT';
foreach ($strings as $string) {
    $string = preg_replace('/\s*\$item_#1_Value\$\s*/i', "1234", $string);
    echo $string.PHP_EOL;
}

Demo

Result

ABC1234QWERT

ABC1234QWERT

ABC1234QWERT

edited Mar 13, 2018 at 2:54

answered Mar 13, 2018 at 2:41

ishegg

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4 Comments

Serge S Over a year ago

Your first answer is not suitable, it will remove ALL spaces, not only adjacent. I did not provide samples with those spaces, but I have mentioned it in my explanation. Second suggestion seems like exactly what I need, thank you, will go to test.

ishegg Over a year ago

@SergeS I seem to have missed that part, sorry. I've updated the answer. Notice the second answer is edited too to meet your needs.

Serge S Over a year ago

Works perfectly! Thank you again.

ishegg Over a year ago

Happy to help my friend.

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