I can not search the words in brackets in php

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I've created a function to check if some words exist in an array. I want to do the word search inside brackets "[]". Example: [as], [dar], [amar] ...

For this, I'm using the preg_match () function to check if any of the words in the array exist. However, the function is accepting word verification without the brackets.

Example: The word "darkgreen" is accepted, because it has "give" at the beginning, but I just want you to accept "[give]"

This is my code and an example text where I check:

My code: 

private function existeAlgum($post){
    $saida = array();

    foreach ($this->termos as $termo) {
        $er = "[".$termo."]";
        if(preg_match($er,$post)){
            $saida[] = $termo;
        }
    }

    return $saida;
}

Array example: 

 <dl>
    <dt><b><font color="maroon">como</font></b> 

    <font color="maroon">[como]</font>  &lt;rel&gt; &lt;ks&gt; <font color="blue"><b>ADV</b> </font> <font color="darkgreen">@ADVL&gt;</font> <font color="darkgreen"><b>@#FS-ADVL</font></b> <font color="darkgreen"><b>@#FS-N&lt;</font></b>
    <dt><b><font color="maroon">não</font></b> 

    <font color="maroon">[não]</font>  <font color="blue"><b>ADV</b> </font> <font color="darkgreen">@ADVL&gt;</font>
    <dt><b><font color="maroon">amar</font></b> 

    <font color="maroon">[amar]</font>  &lt;vt&gt; <font color="blue"><b>V</b> FUT 1/3S SUBJ VFIN </font> <font color="darkgreen">@FMV</font>
    <dt><b><font color="maroon">uma</font></b> 

    <font color="maroon">[um]</font>  &lt;arti&gt; <font color="blue"><b>DET</b> F S </font> <font color="darkgreen">@&gt;N</font>
    <dt><b><font color="maroon">pessoa</font></b> 

    <font color="maroon">[pessoa]</font>  &lt;H&gt; <font color="blue"><b>N</b> F S </font> <font color="darkgreen">@&lt;ACC</font>
    <dt><b><font color="maroon">tão</font></b> 

    <font color="maroon">[tão]</font>  &lt;dem&gt; &lt;quant&gt; <font color="blue"><b>ADV</b> </font> <font color="darkgreen">@&gt;A</font>
    <dt><b><font color="maroon">linda</font></b> 

    <font color="maroon">[lindo]</font>  <font color="blue"><b>ADJ</b> F S </font> <font color="darkgreen">@N&lt;</font>
    <dt><b><font color="maroon">.</font></b> 

    </dl>
    
asked by anonymous 28.08.2015 / 00:31

1 answer

5

You are using brackets. They are elements of the syntax of regular expressions.

In addition, the preg_match function needs an initial delimiter which in this case can be the hashtag # . And to accept the bracket as part of the string, use backslash as a escape character.

Looking like this: 

private function existeAlgum($post){
    $saida = array();

    foreach ($this->termos as $termo) {
        $er = "#\[".$termo."\]#";
        if(preg_match($er,$post)){
            $saida[] = $termo;
        }
    }

    return $saida;
}
    
28.08.2015 / 00:49
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