用于从原始文本/表格中提取数据（聚合）的正则表达式答案

【问题标题】：RegEx for extracting data (aggregate) from raw text / table用于从原始文本/表格中提取数据（聚合）的正则表达式
【发布时间】：2019-06-04 07:50:57
【问题描述】：

我正在处理一个正则表达式任务，我需要创建一个正则表达式以在文本文件 > 表中进行识别

第一列以VI-开头并以(PP)或(DB)结尾的所有行，提取最后一列的绝对值并将其相加（即0.73 + 0.11...）。

然后打印总值。

这是附加的文本文件。


FEES          Amount charged to authorize, process and settle card transactions, along with transaction-based and/or fixed amounts charged for specific card processingservices.
            MC-WORLDCARD RESTAURANT                                                                                      Interchange charges                      -$13.85
            MC-CORP T & E I(US) BUS                                                                                      Interchange charges                            -$0.85
            MC-CORP T & E I(US) CORP                                                                                     Interchange charges                            -$3.18
            MC-WORLD ELITE RESTAURANT                                                                                    Interchange charges                      -$22.02
            MC-HIGH VAL RESTAURANT                                                                                       Interchange charges                            -$2.16
            MC-DOMESTIC MERIT III                                                                                        Interchange charges                            -$3.74
            MC-RESTAURANT (DB)                                                                                           Interchange charges                            -$2.22
            MC-DOMESTIC MERIT III (DB)                                                                                   Interchange charges                            -$2.03
            MASTERCARD SALES DISCOUNT .006 DISC RATE TIMES $2743.61                                                        Service charges                        -$16.46
            MC LICENSE VOLUME FEE .000061 DISC RATE TIMES $3143.14                                                         Service charges                              -$0.19
            MASTERCARD DEBIT SALES DISC .006 DISC RATE TIMES $399.53                                                       Service charges                              -$2.40
            MASTERCARD AUTH FEE 96 TRANSACTIONS AT .05                                                                          Fees                                    -$4.80
            MC NETWORK ACCESS AUTH FEE 96 TRANSACTIONS AT .0195                                                                 Fees                                    -$1.87
        VISA
            VI-US REGULATED COMM (DB)                                                                                    Interchange charges                            -$0.51
            VI-CPS SMALL TICKET (PP)                                                                                     Interchange charges                            -$0.11
            VISA ASSESSMENT FEE CR .0014 TIMES $6964.33                                                                  Interchange charges                            -$9.75
            VISA ASSESSMENT FEE DB .0013 TIMES $2168.68                                                                  Interchange charges                            -$2.82
            VI-CPS/RESTAURANT (DB)                                                                                       Interchange charges                            -$7.77
            VI-CORPORATE TRAVEL SVC                                                                                      Interchange charges                            -$2.73
            VI-CPS/RESTAURANT CREDIT                                                                                     Interchange charges                            -$7.23
            VI-PURCHASING TRAVEL SVC                                                                                     Interchange charges                            -$1.23
            VI-ELECTRONIC (US ACQ)                                                                                       Interchange charges                            -$0.46
            VI-INTER PREM LAC ISS US ACQ                                                                                 Interchange charges                            -$3.13
            VI-SIGNATURE PREFERRED CRP ELC                                                                               Interchange charges                      -$60.70
            VI-SIGNATURE CARD ELECTRONIC                                                                                 Interchange charges                      -$52.58
            VI-BUSINESS CARD TR2 ELEC T&E                                                                                Interchange charges                            -$9.21
            VI-BUSINESS CARD TR4 ELEC                                                                                    Interchange charges                            -$8.97
            VI-BUSINESS CARD CP (DB)                                                                                     Interchange charges                            -$0.54
            VI-CPS/RESTAURANT (PP)                                                                                       Interchange charges                            -$0.73
            VI-CPS/SMALL TICKET                                                                                          Interchange charges                            -$3.62
            VI-BUSINESS CARD TR1 ELEC T&E                                                                                Interchange charges                            -$6.32
            VI-BUSINESS CARD TR3 ELEC T&E                                                                                Interchange charges                            -$7.46
            VI-CPS SMALL TICKET (DB)                                                                                     Interchange charges                            -$1.12
            VI-US REGULATED (DB)                                                                                         Interchange charges                            -$7.89
            VI-CPS/REWARDS 2                                                                                             Interchange charges                      -$16.87
            VI-US HNW CONSUMER ELECT                                                                                     Interchange charges                            -$0.81
            VI-US CPS/SMALL TCKT REG (DB)                                                                                Interchange charges                            -$1.58
            VISA DEBIT SALES DISCOUNT .006 DISC RATE TIMES $2168.68                                                        Service charges                        -$13.01
            VISA SALES DISCOUNT .006 DISC RATE TIMES $6964.33                                                              Service charges                        -$41.79
            VISA AUTH FEE 280 TRANSACTIONS AT .05                                                                               Fees                              -$14.00
            ACQUIRER PROCESSOR FEE DB/PP 65 TRANSACTIONS AT .0155                                                               Fees                                    -$1.01
            ACQUIRER PROCESSOR FEE CREDIT 212 TRANSACTIONS AT .0195                                                             Fees                                    -$4.13
        DISCOVER
            DSCVR PSL REST PR                                                                                            Interchange charges                            -$4.01
            DSCVR PSL REST PP                                                                                            Interchange charges                            -$0.86
            DISCOVER ASSESSMENT FEE .0013 TIMES $960.98                                                                  Interchange charges                            -$1.25
            DSCVR COMML ELECT OTHER                                                                                      Interchange charges                            -$4.06
            DSCVR PSL EXP SVC PR                                                                                         Interchange charges                            -$0.62
            DSCVR PSL EXP SVC RW                                                                                         Interchange charges                            -$1.62
            DSCVR PSL REST RW                                                                                            Interchange charges                      -$10.91
            DISCOVER SALES DISCOUNT .006 DISC RATE TIMES $960.98                                                           Service charges                              -$5.77
            DISCOVER DATA USAGE FEE 35 TRANSACTIONS AT .0195                                                               Service charges                              -$0.68
            DISCOVER AUTH FEE 35 TRANSACTIONS AT .05                                                                            Fees                                    -$1.75
            NETWORK AUTHORIZATION FEE 35 TRANSACTIONS AT .0025                                                                  Fees                                    -$0.09
        AMERICAN EXPRESS
            AMEX AUTH FEE 17 TRANSACTIONS AT .05                                                                                Fees                                    -$0.85

这是php代码。

<?php 
    $file = fopen("sampledata.txt", "r") or die("Cannot open file!\n"); 

    $regex = "/VI-\w.+?(\(PP\)|\(DB\))+/g"; // regex, but it selected the individual row > field. see the sreenshot.
    $total = 0;

    while ($line = fgets($file, 1024)) { 

        preg_match_all($regex, $line, $matches, PREG_OFFSET_CAPTURE);

        if (count($matches) > 0) { 

            // sum the matching value.
        } else { 
            echo "No match: "; 
        } 
    }

    fclose($file);

    print_r($total);

?>

正则表达式结果

【问题讨论】：

你不能用正则表达式做加法，它只是用来匹配的。您需要一种编程语言来添加匹配的值。 awk 是匹配正则表达式、从匹配行中提取数据和进行计算的好语言。
以(PP) 或(DB) 结尾的行中没有数字。应该如何添加这些数字？
使用+? 使其使用非贪婪匹配。
s 修饰符使它匹配多行。如果你只想匹配一行，不要使用s。
s 修饰符在 PHP 脚本中无关紧要，因为您使用的是 fgets()，它一次只读取一行。

标签： php regex preg-match-all regex-lookarounds regex-group

【解决方案1】：

不需要 preg_match_all，g 标志是 preg_match 隐含的，如果你想对它们求和，你必须捕获行尾的值。

使用：/VI-.+?$(?:PP|DB)$.+?\$(\d+(?:\.\d\d)?)/

说明：

/               # regex delimiter
  VI-           # literally VI-
  .+?           # 1 or more any character but newline, not greedy
  \(            # opening parenthesis
  (?:           # non capture group
    PP|DB       # PP or DB
  )             # end group
  \)            # closing parenthesis
  .+?           # 1 or more any character but newline, not greedy
  \$            # $ sign
  (             # start group 1
    \d+         # 1 or more digits
    (?:         # non capture group
      \.\d\d    # a dot and 2 digits
    )?          # end group, optional
  )             # end group 1
/               # regex delimiter

代码：

$file = fopen("file.txt", "r") or die("Cannot open file!\n"); 

$regex = '/VI-.+?\((?:PP|DB)\).+?\$(\d+(?:\.\d\d)?)/'; 
$total = 0;
while ($line = fgets($file, 1024)) { 
    if (preg_match($regex, $line, $matches)) {
        $total += $matches[1];
    } 
}
fclose($file);
echo $total,"\n";

输出（例如）：

20.25

【讨论】：