正则表达式给出所有字母

Question

我需要一个字符串中所有 4 个大写字母组。

所以我正在使用 REGEXP_REPLACE([Description],'\b(?![A-Z]{4}\b)\w+\b',' ') in Tableau 替换所有小写字母和多余字符。我只想获取字符串长度为 4 的大写字母实例。

通过 google 我知道我不能使用 Regex_extract（因为不支持 /g）

我的字符串：

"The following trials have no study data-available, in the RBM mart. It appears as is this because they were . In y HIWEThe trials currently missing data are: JADA, JPBD, JVCS, JADQ, JVDI, JVDO, JVTZ"

我写了[^A-Z]{4}/g。

我要：

HIWE JADA JPBD JVCS JADQ JVDI JVDO JVTZ

但这也给了我一个大写字母和 space 包括在内。

谢谢

Answer 1

您可以使用 this regex:

((?<=[A-Z]{4})|^).*?(?=[A-Z]{4}|$)

解释：

(                    # one of:
    ^                # the starting position
  |                  # or
    (?<=[A-Z]{4})    # any position after four upper letters
)                    # 
.*?                  # match anything till the first:
(?=                  # position which in front
    [A-Z]{4}         # has four upper letters
  |                  # or
    $                # is the string's end
)                    #

如有任何疑问，请随时提问:)

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