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PORegular expression to parse YAML list
 

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  1. PORegular expression to parse YAML list
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    <p>I've got a YAML list like this and need to parse it with a regular expression in Java:</p> <pre><code>stacks: - name: test1 folder: a - name: test2 folder: b </code></pre> <p>In the end I would like to iterate the list text blocks. That means after creating a Pattern instance, I'd like the Matcher instance for this text to find two matches:</p> <p>1.</p> <pre><code>name: test1 folder: a </code></pre> <p>2.</p> <pre><code>name: test2 folder: b </code></pre> <p>When ignoring the list name ("stacks" above), I could do the following:</p> <pre><code>String regex = "^\\s++-(.*$\\n(?:^\\s++[^-].*$\\n)*)"; Pattern p = Pattern.compile( regex, Pattern.MULTILINE | Pattern.UNIX_LINES ); Matcher m = p.matcher( data ); </code></pre> <p>A matcher generated with this expression would find the two matches that I need.</p> <p>However, I actually don't want to ignore the list name and I would like to state "take all list elements after the following list name" (like a method call <code>getListData(yamlData, listName)</code>). It seems that I would need a positive backward lookbehind. Unfortunately, I didn't find a way to do this while still getting two matches. Do you have any idea?</p> <p><em>(I know there is snakeyaml and other libraries. Unfortunately, I need to use regular expressions here.)</em></p> <p><strong>Edit</strong>: I can't make any assumptions about the order of the elements of the listed objects. A solution must be able to deal with name and folder (and potentially others) swapped.</p>
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    1. UStomka
    1. UStomka
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    1. COso you want `getListData` to return all the name-folder pairs in it..
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      1. PORegular expression to parse YAML list
      1. USAnirudha
    2. CO@Some1.Kill.The.DJ: Yes, it should return whatever list items there are as a list. In the example above it should return a list ["name: test1\nfolder: a", "name: test2\nfolder: b"]
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      1. PORegular expression to parse YAML list
      1. UStomka
 

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