* **Replace wrappers around strings**
Find string
```
<\?= __\('(.*)?'\) \?>  // <?= __('必須') ?>
```
Substitution
```
<!-- ko i18n: '$1'--><!-- /ko --> //<!-- ko i18n: '必須'--><!-- /ko -->
```
* **Trim unicode/UTF-8 whitespace in PHP**
```
preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $string);
```