Hello Monks

My Input is 

<level1 id="L1_0001">
    <level2>
        <level3>
            <level4>
        <level3>
            <level4>
    <level2>
    <level2>
<level1 id="L1_0002">
<level1 id="L1_0003">
    <level2>
        <level3>

[download]

I need id for level2 is id of immediate above level1's 

<level1 id="L1_0001">
    <level2  id="L1_0001">
        <level3>
            <level4>
        <level3>
            <level4>
    <level2 id="L1_0001">
    <level2 id="L1_0001">
<level1 id="L1_0002">
<level1 id="L1_0003">
    <level2 id="L1_0003">
        <level3>

[download]

I tried the following 

$content =~s#(<level1 id=\"([^"]*)\"(?:(?!<level1).)*?)<level2>#$1<lev
+el2 id="$2">#gsi;

[download]

I got (didn't get for every level2) 

<level1 id="L1_0001">
    <level2 id="L1_0001">
        <level3>
            <level4>
        <level3>
            <level4>
    <level2>
    <level2>
<level1 id="L1_0002">
<level1 id="L1_0003">
    <level2 id="L1_0003">
        <level3>

[download]

Pls help me to add id for missing level2

Thanks

Siva

2006-09-14 Retitled by planetscape, as per Monastery guidelines

( keep:0 edit:23 reap:0 )

Original title: 'Regex problem'

In reply to Regex problem while parsing tagged, hierarchical data by sivaramanm

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