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POescape character using indexOf()
 

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    <p>I'm reading a file line by line into sting and split it into smaller strings using <code>line.indexOf('"', 1)</code> and <code>substring()</code> but this way doesn't detect whether before <code>"</code> is <code>\</code> or not so it doesn't react to escape char. how do I solve this?</p> <p>(I cannot just use <code>line.split('"')</code> couse <code>"</code> are both at beginning and ending of substring, nor split by other char, cause my task does not allow so.)</p> <p>the whole reading segment is: </p> <pre><code>while ((line = bufferedReader.readLine()) != null) { System.out.println(line); while(line.length()&gt;0){ if(line.charAt(0) == ',' || line.charAt(0) == ' '){ line = line.substring(1); } else{ if(line.indexOf(',') != -1){ if (line.charAt(0) == '"'){ pabaiga = line.indexOf("\"", 1); zodis = line.substring(0, pabaiga+1); line = line.substring(pabaiga+1); duomenys.add(zodis); } else{ pabaiga = line.indexOf(','); zodis = line.substring(0, pabaiga); line = line.substring(pabaiga); duomenys.add(zodis); } } else{ zodis = line; line = line.substring(line.length()); duomenys.add(zodis); } } for(String elem : duomenys){ System.out.println(elem); } duomenys.removeAll(duomenys); } </code></pre> <p>I was not allowed to split only by , separator as there could be one in the middle of the string, using \, in text file was not an option. So I was suggested to determine one sting element as " text" but if it contains another " or \" in the middle, my current code doesnt work.</p> <p>if my line from text file is <code>"start \"title\" end", 10, 20, "text"</code><br> the sting array should contain </p> <ul> <li>[0] <code>"start "title" end"</code> </li> <li>[1] <code>10</code> </li> <li>[2] <code>20</code> </li> <li>[3] <code>"text"</code></li> </ul>
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    1. USPshemo
    1. USuser2542809
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    1. COPlease provide an example of the input. I imagine you can you `split` as it takes a regex.
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      1. USBoris the Spider
    2. COUse a regular expression to solve your problem. You can define a regular expression negation that only matches when the preceding character is not a backslash (\)
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      1. USsjkm
    3. COPlease [[edit]] your question with few examples of input and expected output because now your question is not very clear about what you are trying to achieve.
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      1. USPshemo
 

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