如何仅获取 RegEx 的第一个匹配项(UiPath Studio RegEx Based Extractor) [英] How to get only the first match of a RegEx (UiPath Studio RegEx Based Extractor)

问题描述

我使用 UiPath Studio 的 OCR 从 PDF 中提取了以下文本.由于它是原始、重复和重复的文本块，因此它重复了 3 次.同一 PDF 页面一式三份.

I have the following text that I extracted from a PDF using UiPath Studio's OCR. It's the same block of text repeated 3 times due to it being the original, duplicate & triplicate of the same PDF page.

Os bens/serviços foram colocados à disposição do adquirente em 2020-04-16 * Data/Hora início de transporte: 2020-04-16 às 11:52

Total Líquido               500,00
Total de Descontos 500,00         
Desconto Documento                
Total de IVA                115,00
Total do Documento (EUR)    615,00

IVA      Incidência   Valor do IVA
Isento                            
6%                                
13%                               
23%      500,00       115,00      

b5El-Processado por programa certificado n.º75/AT.

Os bens/serviços foram colocados à disposição do adquirente em 2020-04-16 * Data/Hora início de transporte: 2020-04-16 às 11:52

Total Líquido               500,00
Total de Descontos 500,00         
Desconto Documento                
Total de IVA                115,00
Total do Documento (EUR)    615,00

IVA      Incidência   Valor do IVA
Isento                            
6%                                
13%                               
23%      500,00       115,00      

b5El-Processado por programa certificado n.º75/AT.

Os bens/serviços foram colocados à disposição do adquirente em 2020-04-16 * Data/Hora início de transporte: 2020-04-16 às 11:52

Total Líquido               500,00
Total de Descontos 500,00         
Desconto Documento                
Total de IVA                115,00
Total do Documento (EUR)    615,00

IVA      Incidência   Valor do IVA
Isento                            
6%                                
13%                               
23%      500,00       115,00      

b5El-Processado por programa certificado n.º75/AT.

我需要提取-Processado por programa"后面的 4 个字符的代码；但只想要一场比赛或第一场比赛.

I need to extract the 4 character code behind "-Processado por programa" but just want 1 match or the 1st match.

已经试过[^*]+(?=-Processado\spor\sprograma)和(.*?)(?=-Processado\spor\sprograma)但这会输出 3 个匹配项.

Already tried [^*]+(?=-Processado\spor\sprograma) and (.*?)(?=-Processado\spor\sprograma) but that outputs me 3 matches.

当我删除 /g 标志时它起作用了，但我使用的是 UiPath Studio 的 RegEx 提取器，我不知道如何在该程序上删除该标志.

It worked when I removed the /g flag but I'm using UiPath Studio's RegEx extractor and I don't know how to remove that flag on that program.

推荐答案

您可以匹配所有不以 4 个单词字符开头的行和 -Processado por programa 使用否定前瞻.

You could match all lines that do not start with 4 word characters and -Processado por programa using a negative lookahead.

当你遇到这样的行时，捕获第 1 组中的前 4 个单词字符

When you encounter the line that does, capture the first 4 word characters in group 1

\A.*(?:\r?\n(?!\w{4}-Processado\spor\sprograma\b).*)*\r?\n(\w{4})

说明

• \A.* 断言字符串开头的位置和除换行符以外的任何字符 0+ 次
• (?: 非捕获组
  • \r?\n 匹配换行
  • (?!\w{4}-Processado\spor\sprograma\b) 负前瞻，断言不是 -Processado por programa 直接向右
  • .* 匹配该行的其余部分
  • \A.* Assert the position at the start of the string and any char except a newline 0+ times
  • (?: Non capture group
    • \r?\n Match a newline
    • (?!\w{4}-Processado\spor\sprograma\b) Negative lookahead, assert not -Processado por programa directly to the right
    • .* Match the rest of the line

    正则表达式演示

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