[英]JavaScript regex captures only the last group occurrence
I am trying to parse a documentation text, which is formatted like this : 我正在尝试解析文档文本,其格式如下:
className : String
A text
colHeaders : Boolean (default false)
colHeaders : Array [A, B, C, ...]
colHeaders : Function function(index) { return ... }
Another text
( Full documentation here ) ( 这里有完整的文档 )
So every option in the documentation can be of multiple types, and I want to programatically recover them. 因此,文档中的每个选项都可以是多种类型,我想以编程方式恢复它们。 I created a JavaScript regex : 我创建了一个JavaScript正则表达式:
^(\w+) : (\w+)[^\n]*(?:\n\1 : (\w+)[^\n]*)*
( Regex101 demo page here ) ( Regex101演示页面在这里 )
I successfully retrieve the first option type ('String' and 'Boolean' in the example above), but as far as the second part of the regex is concerned I can only retrieve the last group ('Function', where I would like both 'Array' and 'Function'). 我成功地检索了第一个选项类型(在上面的示例中为“ String”和“ Boolean”),但是就正则表达式的第二部分而言,我只能检索最后一个组(“ Function”,我想两者都“数组”和“功能”)。
If I remove the '*' quantifier at the end of the regex, I only retrieve 'Array' (same thing if I add the non-greedy symbol '?' after it), but once again I would like both. 如果删除正则表达式末尾的“ *”量词,则仅检索“数组”(如果在其后添加非贪婪符号“?”,则是相同的事情),但我又想两者都使用。 Is there a way to do that in a JS regex ? 有没有办法在JS正则表达式中做到这一点?
"Is there a way to do that [access previous captures of a certain group] in a JS regex?" “有没有办法在JS正则表达式中[访问特定组的先前捕获]?” - No. -不
You can however use two regexes - one that captures blocks: 但是,您可以使用两个正则表达式-一个捕获块的正则表达式:
/^(\w+) : .*(?:\n^\1.*)*/gm
and one that parses a block into lines: 还有一个将一个块解析成几行:
/^\w+ : (\w+)\s*(.*)/gm
as in 如
var str = [
'className : String',
'A text',
'colHeaders : Boolean (default false)',
'colHeaders : Array [A, B, C, ...]',
'colHeaders : Function function(index) { return ... }',
'Another text'
].join("\n"),
reBlock = /^(\w+) : .*(?:\n^\1.*)*/gm,
reLine = /^\w+ : (\w+)\s*(.*)/gm,
block, line;
while (block = reBlock.exec(str)) {
console.log(block[1]);
while (line = reLine.exec(block[0])) {
console.log(" - ", line[1], line[2]);
}
}
prints 版画
className - String colHeaders - Boolean (default false) - Array [A, B, C, ...] - Function function(index) { return ... }
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