Question

我正在使用Javascript和正则表达式解析“csv like flavor”中的一些字符串，其中;为分隔符。我到目前为止所发现的正则表达式试图让所有出现的模式如：“INTERESTING1 (INTERESTING2; INTERESTING3)”。

我面临的问题是我只能匹配整个字符串中最后一个出现的模式，而我想匹配所有出现的模式。我已经尝试了Javascript函数exec()和match() ，有或没有一些循环，但我无法弄清楚我在做什么有什么问题？

var complexString = 'some boring stuff; some other boring stuff; interesting prefix (interesting inner stuff1; interesting inner stuff2; etc.); boring stuff; another interesting prefix (another interesting string 1; another interesting string 2; etc.)';
//var complexString = 'XXX';

// regex to apply
var roundBraketsRegex =  /.*;(.*)\((.*)\)/g; // string pattern: "INTERESTING1 (INTERESTING2; INTERESTING3)"
// array of matched groups
var matchesArray = roundBraketsRegex.exec(complexString);

var outputString = '';

if(matchesArray == null ) {
    outputString = 'NULL!!! ';
} 

// I have tried also the following commented line with stuff related to 
// while loops and functions like .exec() or .match()

//while ((matchesArray = roundBraketsRegex.match( complexString )) != null) {
outputString = outputString + ' ### ' + matchesArray[1] + ' ### ' + matchesArray[2] + ' ### NOT INTERESTED IN: ' + matchesArray[0];
//}


// print what has been found
console.log(document.getElementById('result'));
document.getElementById('result').innerHTML = outputString;

输出（我在Stackoverflow中手动添加了一些回车，只是为了让字符串更具可读性）：

### another interesting prefix 
### another interesting string 1; another interesting string 2; etc. 
### NOT INTERESTED IN: some boring stuff; some other boring stuff; interesting prefix (interesting inner stuff1; interesting inner stuff2; etc.); boring stuff; another interesting prefix (another interesting string 1; another interesting string 2; etc.)

Answer 1

您需要了解正则表达式的事情是，匹配器的多次运行只会找到非重叠目标。如果你的正则表达式捕获太多，那么你将无法通过额外的运行找到额外的匹配。

尝试使用这个捕获较少的正则表达式：

([^;]+?)\s+\(([^\)]*)\)

它有两个捕获组，它们在括号中抓取有趣的前缀和其他有趣的东西。请注意，您需要在结果上使用String.trim（）。这是在Regex 101上解释的正则表达式。

这是最终的JavaScript解决方案，其中包括正则表达式：

var complexString = 'some boring stuff; some other boring stuff; interesting prefix (interesting inner stuff1; interesting inner stuff2; etc.); boring stuff; another interesting prefix (another interesting string 1; another interesting string 2; etc.)';
var roundBraketsRegex =  /([^;]+?)\s+\(([^\)]*)\)/g;        
var matchesArray;
var i = 1;

while (matchesArray = roundBraketsRegex.exec(complexString)) {
    var group1 = matchesArray[1].trim();
    var group2 = matchesArray[2].trim();
    console.log("Match #" + i + " [1]: '" + group1 + "' [2]: '" + group2 + "'");
    ++i;
}

以下是运行上述内容的输出：

Match #1 [1]: 'interesting prefix' [2]: 'interesting inner stuff1; interesting inner stuff2; etc.'
Match #2 [1]: 'another interesting prefix' [2]: 'another interesting string 1; another interesting string 2; etc.'

我希望你觉得这很有帮助。

- 乔纳森

使用正则表达式在javascript中匹配多个匹配项

1 个答案: