Remove Nested Patterns with One Line of JavaScript - The Diigo Meta page

• 06 Apr 09
  

  Sam Goody

  Scripting Regex Snippets stevenleviathon

• 30 May 08
  

  Lindsay Donaghe

  A javascript snippet that uses a while loop and regex pattern to remove string that are nested in other strings in a single line. Seems like there might be other possibilities for this usage pattern. Nice discovery.

  javascript regex codesnippets tutorials

  • var str = "abc<1<2<>3>4>def";
    
    while (str != (str = str.replace(/<[^<>]*>/g, "")));
    
    // str -> "abcdef"
  • var str = "abc(d(e())f)(gh)ijk()",
    re = /\([^()]*\)/,
    output = [],
    match, parts, last;
    
    while (match = re.exec(str)) {
    parts = match[0].split("\uFFFF");
    if (parts.length < 2)
    last = output.push(match[0]) - 1;
    else
    output[last] = parts[0] + output[last] + parts[1];
    str = str.replace(re, "\uFFFF");
    }
    
    // output -> ["(d(e())f)", "(gh)", "()"]

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