$re = '/(?(DEFINE)
(?<recurs>
(?! {@|@} ) [^|] [^{@|\\\\]* ( \\\\.[^{@|\\\\]* )* | (?R)
)
)
{@
(?<If>\w+)-
(?<Condition>(%?\w++ (:\w+)*)* )
(?<True> [|] [^{@|]*+ (?&recurs)* )
(?<False> [|] (?&recurs)* )?
\s*@}/x';
$str = '{@if-statement:sub%statement2|
<header id="header_home">
<div class="in">
<div class="top">
<h1 class="logo"><a href="/"><img src="/img/logo-home.png" alt=""></a></h1>
<div class="login_outer_wrapper">
<button id="login"><div class="a"><i class="stripe"><i></i></i>Log in</div></button>
<div id="login_wrapper">
<form method="post" action="{^login^}" id="form_login_global">
<div class="form_field no_description">
<label>{!auth:login_email!}</label>
<div class="input"><input type="text" name="form[login]"></div>
</div>
<div class="form_field no_description password">
<label>{!auth:password!}</label>
<div class="input"><input type="password" name="form[password]"></div>
</div>
<div class="remember">
<input type="checkbox" name="remember" id="remember_me_check" checked>
<label for="remember_me_check"><i class="fa fa-check" aria-hidden="true"></i>Remember</label>
</div>
<div class="submit_box">
<button class="btn btn_check">Log in</button>
</div>
</form>
</div>
</div>
</div>
<div class="content clr">
<div class="main_menu">
<a href="">
<i class="ico a"><i class="fa fa-lightbulb-o" aria-hidden="true"></i></i>
<span>Idea</span>
<div> </div>
</a>
<a href="">
<i class="ico b"><i class="fa fa-user" aria-hidden="true"></i></i>
<span>FFa</span>
</a>
<a href="">
<i class="ico c"><i class="fa fa-briefcase" aria-hidden="true"></i></i>
<span>Buss</span>
</a>
</div>
<div class="text_wrapper">
<div>
<div class="register_wrapper">
<a id="main_register" class="btn register">Załóż konto</a>
<form method="post" action="{^login^}" id="form_register_home">
<div class="form_field no_description">
<label>{!auth:email!}</label>
<div class="input"><input type="text" name="form2[email]"></div>
</div>
<div class="form_field no_description password">
<label>{!auth:password!}</label>
<div class="input tooltip"><input type="password" name="form2[password]"><i class="fa fa-info-circle tooltip_open" aria-hidden="true" title="{!auth:password_format!}"></i></div>
</div>
<div class="form_field terms no_description">
<div class="input">
<input type="checkbox" name="form2[terms]" id="terms_check">
<label for="terms_check"><i class="fa fa-check" aria-hidden="true"></i>Agree</label>
</div>
</div>
<div class="form_field no_description">
<div cl\\|\\|ass="input captcha_wrapper">
<div class="g-recaptcha" data-sitekey="{%captcha_public_key%}"></div>
</div>
</div>
<div class="submit_box">
<button class="btn btn_check">{!auth:register_btn!}</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</header>|{@if-statement2|echo this|{@if-statement2|echo this|echo othe\\|\\|rwise@}@}
@}';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php