Question

我正在尝试将输入字符串与正则表达式模式匹配，如下所示：

formatDate(){
 d='[[:digit:]]'
 pattern_a="($d$d$d$d)($d$d)($d$d) ($d$d)($d$d)($d$d)"
 pattern_b="($d$d$d$d)($d$d)($d$d)_($d$d)($d$d)($d$d)"
 pattern_c="($d$d$d$d)($d$d)($d$d):($d$d)($d$d)($d$d)"
 pattern_d="($d$d$d$d)($d$d)($d$d)($d$d)($d$d)($d$d)"
 pattern_e="($d$d$d$d)($d$d)($d$d)($d$d)($d$d)($d$d)($d$d$d)"

 unparsable_date="Unable to parse date!"
 TM="TM"

appName="$1"
actionType="$2"
position="$3"
timestamp="$4"

shopt -s nocasematch
    case "$position" in
       "YYYYMMDD HHMMSS"|"YYYYMMDD_HHMMSS"|"YYYYMMDD:HHMMSS"|"YYYYMMDDHHMMSS"|"YYYYMMDDHHMMSSSSS")
            if [[ $timestamp =~ $pattern_a|$pattern_b|$pattern_c|$pattern_d|$pattern_e ]]; then
               formattedDate=${BASH_REMATCH[1]}${BASH_REMATCH[2]}${BASH_REMATCH[3]}
               formattedTime=${BASH_REMATCH[4]}${BASH_REMATCH[5]}${BASH_REMATCH[6]}
               formattedTimeStamp="$appName$actionType$formattedDate $appName$actionType$TM$formattedTime"
           else
               formattedTimeStamp=$unparsable_date
            fi
       ;;
    esac

 }

如果我的输入符合$ pattern_a，则formattedTimeStamp的值会正确填充，如下所示：

输入 - formatDate "appName" "actionType" "YYYYMMDD HHMMSS" "20170426 102300"

输出 - appNameactionType20170426 appNameactionTypeTM102300

在所有其他场景中，即与pattern_a之外的任何模式匹配，代码都不会产生正确的输出，

 appNameactionType appNameactionTypeTM 
"date and time is missing here "

感谢任何帮助！

Answer 1

好吧，我用for循环替换了case语句。现在可以正常工作。

#!/bin/bash
d='[[:digit:]]'
 pattern_a="($d$d$d$d)($d$d)($d$d) ($d$d)($d$d)($d$d)"
 pattern_b="($d$d$d$d)($d$d)($d$d)_($d$d)($d$d)($d$d)"
 pattern_c="($d$d$d$d)($d$d)($d$d):($d$d)($d$d)($d$d)"
 pattern_d="($d$d$d$d)($d$d)($d$d)($d$d)($d$d)($d$d)"
 pattern_e="($d$d$d$d)($d$d)($d$d)($d$d)($d$d)($d$d)($d$d$d)"
 unparsable_date="Unable to parse date!"

 TM="TM"

appName="appName"
actionType="actionType"
position="YYYYMMDD_HHMMSS"
timestamp="20170426_102300"
declare -a arr=( "$pattern_a" "$pattern_b" "$pattern_c" "$pattern_d" "$pattern_e")

for i in "${arr[@]}"
do
   if [[ $timestamp =~ $i ]]; then
    formattedDate=${BASH_REMATCH[1]}${BASH_REMATCH[2]}${BASH_REMATCH[3]}
    formattedTime=${BASH_REMATCH[4]}${BASH_REMATCH[5]}${BASH_REMATCH[6]}
    formattedTimeStamp="$appName$actionType$formattedDate $appName$actionType$TM$formattedTime"
    echo $formattedTimeStamp
    fi
done

BASH_REMATCH匹配任何正则表达式并提供输出

1 个答案: