我在R中使用gsub将文本添加到字符串的中间.它工作得很好,但由于某种原因,当位置太长时,它会抛出错误.代码如下:
gsub(paste0('^(.{', as.integer(loc[1])-1, '})(.+)$'), new_cols, sql)
Run Code Online (Sandbox Code Playgroud)Error in gsub(paste0("^(.{273})(.+)$"), new_cols, sql) : invalid regular expression '^(.{273})(.+)$', reason 'Invalid contents of {}'
当括号中的数字(在这种情况下为273)较小时,此代码可以正常工作,但当它很大时则不行.
这会产生错误:
sql <- "The cat with the bat went to town. He ate the fat mat and wouldn't stop til the sun came up. He was a fat cat that lived with a rat who owned many hats.The cat with the bat went to town. He ate the fat mat and wouldn't stop til the sun came up. …