JavaScript RegEx 如何動態提取 substring

Question

我需要在動態輸入中提取一個子字符串，我已經實現了我需要的 output，但它只是純硬代碼，所以它不是那么動態和可靠。 我有沒有其他方法可以提取部分“B1003 = 工程名片”（項目描述）和“2”（數量），這些都是動態的，可以輸入完全不同的項目，例如； “O1003 = 鉛筆”、“O1004 = 便簽”。 有沒有辦法在正則表達式中對此進行編碼，以實現更可靠的代碼？

這里讀取的輸入來自使用 Tesseract OCR 提取的文本，我需要提取所需的信息並將其傳遞給另一個服務。

 var requisition = `Lines Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static 1 B1003 = Engineering Business Card Business Cards 2 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic Requester Jay Doe Supplier ABC Corp //this line is static Lines Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static 1 O1003 = Pencil Office Supplies 5 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic Requester Jay Doe Supplier ABC Corp //this line is static `; //rule 1 - Gets all Items + Quantity //rule 2 - Gets all Items //rule 3 - Gets all Quantity //resultArray - Contains Quantity + Item eg 2 B1003 Engineering Business Cards var rule1 = /(B1002 = Accountant Business Card|B1003 = Engineering Business Card|B1001 = Sales and Marketing Business Card|O1001 = Black Ballpen Branded Panda Regular with Eraser|O1002 = Notebook|O1003 = Pencil|O1004 = Stick Notes) (.*) ([0-9]|[0-9][0-9]|[0-9][0-9][0-9])/ var rule2 = /(B1002 = Accountant Business Card|B1003 = Engineering Business Card|B1001 = Sales and Marketing Business Card|O1001 = Black Ballpen Branded Panda Regular with Eraser|O1002 = Notebook|O1003 = Pencil|O1004 = Stick Notes)/ var rule3 = /([0-9]|[0-9][0-9]|[0-9][0-9][0-9])/ var resultarray = [] var stringarray = requisition.split("\n") stringarray.forEach(element => { var result = element.match(rule1) if (result.=null){ var itemName = result[0].match(rule2) var quantity = result[0].match(rule3) resultarray;push (quantity[0]+ " " + itemName[0]) } }). console.log (resultarray,join(", "))

注意：為了讓事情更清楚，這是我從圖例中提取文本的圖像：藍色 - Static 未裝箱 - 動態黃色 - 需要提取的文本（也是動態的）

這是提取的圖像，第一行是static ，第二行是動態的

預期結果是 2 B1003 = Engineering Business Card(, B1002 = Accountant Business Card - 如果代碼中有類似項目，則將 output)請檢查申請變量的注釋。

同樣，我已經可以得到所需的 output，我只需要知道如何使用 RegEx 以不同的方式、更動態和更可靠地完成代碼。 請多多包涵，因為我對 RegEx 了解不多。 謝謝！

Answer 1

簡短的回答：

var requisition = `Lines
Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static
1 B1003 = Engineering Business Card 2 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic
Requester Jay Doe Supplier ABC Corp //this line is static
Lines
Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static
1 O1003 = Pencil Office Supplies 5 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic
Requester Jay Doe Supplier ABC Corp //this line is static
`;

//rule 1 - Gets all Items + Quantity
//rule 2 - Gets all Items
//rule 3 - Gets all Quantity
//resultArray - Contains Quantity + Item e.g. 2 B1003 Engineering Business Cards

var rule1 = /(B1002 = Accountant Business Card|B1003 = Engineering Business Card|B1001 = Sales and Marketing Business Card|O1001 = Black Ballpen Branded Panda Regular with Eraser|O1002 = Notebook|O1003 = Pencil|O1004 = Stick Notes)[^\d]+(\d+) .*/

var resultarray = []

var stringarray = requisition.split("\n")
stringarray.forEach(element => {
    var result = element.match(rule1)
    if (result!=null){
        var itemName = result[1]
        var quantity = result[2]
        resultarray.push (quantity + " " + itemName)
    }
});

console.log (resultarray.join(", "))

Output：

2 B1003 = Engineering Business Card, 5 O1003 = Pencil

長答案：

有很多事情要解決：

1. 僅使用規則 1（經過一些修改）使用 (\d+) 匹配所有內容（項目名稱和數量）
2. 擺脫規則 2 和 3
3. 使用 result[1] 作為項目名稱和 result[2] 作為數量

請注意，您的所有字段都是空格分隔的，並且字段可以包含空格，因此您的數據不是結構化的。 例如，如果您有一個制表符分隔的文件，那將更加可靠。 所以我用來查找數量的規則是“忽略產品名稱之后的所有內容，直到有一個數字”但是如果有一天你有一個包含數字的類別，你會被卡住，沒有一個你將無能為力結構化文件

Answer 2

您可以將它們全部放入一個正則表達式中，並在一組中捕獲quantity ，在另一組中捕獲itemName 。 然后從匹配中提取這些組（如果有匹配）：

 var requisition = `Lines Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static 1 B1003 = Engineering Business Card Business Cards 2 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic Requester Jay Doe Supplier ABC Corp //this line is static Lines Line Item Description Category Name Quantity UOM Price Amount (USD) Status Funds Status //this line is static 1 O1003 = Pencil Office Supplies 5 Ea 50.00USD 100 Pending Approval Not Reserved //this line is dynamic Requester Jay Doe Supplier ABC Corp //this line is static `; var rule = /(B1002 = Accountant Business Card|B1003 = Engineering Business Card|B1001 = Sales and Marketing Business Card|O1001 = Black Ballpen Branded Panda Regular with Eraser|O1002 = Notebook|O1003 = Pencil|O1004 = Stick Notes).*(\d{1,3})/ var resultarray = [] var stringarray = requisition.split("\n") stringarray.forEach(element => { const match = element.match(rule); if (match) { const [, itemName, quantity] = match; resultarray.push(quantity + ' ' + itemName); } }); console.log(resultarray)

舉一個更簡單的例子：

 const input = `Lines foo 1 bar 2 baz don't match`; const pattern = /(foo|bar) (\d+)/; const output = []; input.split('\n').forEach((line) => { const match = line.match(pattern); if (match) { const [, itemName, quantity] = match; output.push(quantity + ' ' + itemName); } }); console.log(output);