折叠字符向量时如何避免空格？

Question

我有一个字符向量，想要一个像这样的输出：

"(WLNXL0427M)|(QWDAF7505E)|(ZTKQC4319H)|(RUQAI0874B)|(BAUPR0486O)"

我用

v <- c("WLNXL0427M", "QWDAF7505E", "ZTKQC4319H", "RUQAI0874B", "BAUPR0486O")
a <- paste("(", v, collapse = "|", ")")
a

得到

"( WLNXL0427M )|( QWDAF7505E )|( ZTKQC4319H )|( RUQAI0874B )|( BAUPR0486O )"

如何避免空格？

Answer 1

也可以使用paste0()，即

v <- c("WLNXL0427M", "QWDAF7505E", "ZTKQC4319H", "RUQAI0874B", "BAUPR0486O")
a <- paste0("(", v, collapse = "|", ")")
a