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POCheck for a especific value inside a string
 

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    <p><strong>UPDATED</strong></p> <p>In my app, I have a continuos communication with a PCB via bluetooth. This communication is made by HEX Strings.</p> <p>The string format is like this:</p> <pre><code>2b(thread init), 05(write command), 09(bytes), 04(variable bytes), 5af2ff1f(memory location), 04a0bcf1(variable value), 7e(checksum) </code></pre> <p>The function of this Hex string is to access to a concrete memory location of the PCB and write a value.</p> <p>To do it easier, lets suppouse that the Hex string is:</p> <pre><code>hex_string= 2B05A82BF1 </code></pre> <p>This string, before sending it via bluetooth, I convert it to a Byte[]. What I need is to create a function that checks all the strings I send. </p> <p>What I must look for, is for any "2B" byte inside the string. This is because the PCB reads the "2b" as a "init thread" value and if there is any "2b" inside the string, the PCB would read it as the init of another thread and the string wouldn't be sent entirely.</p> <p>I don't know if is easier to check this with the Hex String, or after converting it to Byte[].</p> <p>The function would be to disscard the first "2b" of the string and check if there is another "2b" inside the string, and if it is, duplicate it, resulting this.</p> <pre><code>before: hex_string= 2B05A82BF1 after: hex_string= 2B05A82B2BF1 </code></pre> <p>This way the PCB understands that that "2b" is not a init thread value.</p> <p>What I want to do is a function that checks all string for containing "2b" value inside of it. But i don't know if it's better to do this with the Hex string, when converted to byte[]... or when... and how to do it. </p>
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    1. COYou just want to check if the string contain some values. Maybe using substring() is enough ?
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    2. COI have updated the question with a more detalied explanation
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    3. COif im not wrong, u get a string something like 2BXXXXXX2BXXXX and u want it to change like 2BXXXXXX2B2BXXXX
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