如何在一个字符的第一次出现和另一个字符的第一次出现之间提取字符串？
[英]How to extract string between the first occurrence of a character and first occurrence of another character?
问题描述
reprEx <- "jhbasdjjk\n ELECTRONIC WITHDRAWALS kd; jjjjj ELECTRONIC WITHDRAWALS cont. jjjajhahgab OTHER WITHDRAWALS"
我想提取第一次出现电子提款和其他提款之间的所有文本。 我想要的结果如下所示：
desiredResult <- "kd; jjjjj ELECTRONIC WITHDRAWALS cont. jjjajhahgab"
1 个解决方案
解决方案1
1 已采纳 2020-04-09 20:43:15
我们可以使用sub来捕获那些 substring 之间的字符，并替换为捕获组的反向引用
sub(".*\n ELECTRONIC WITHDRAWALS (.*) OTHER WITHDRAWALS", "\\1", reprEx)
#[1] "kd; jjjjj ELECTRONIC WITHDRAWALS cont. jjjajhahgab"
在最后出现的字符和固定表达式之间提取字符串
[英]Extract string between the last occurrence of a character and a fixed expression
在第一次出现模式之后并在另一个模式之前提取字符串
[英]extract string after first occurrence of pattern AND before another pattern
如何标记数据框中第一次出现的字符串以及之后的所有行？
[英]How to flag the first occurrence of a character string in a data frame and all rows after?
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