R函数检查字符串中的多个文本

我面临着在R中找到解决方案的问题

我必须找出有4个文本的字符串：

1. " { M/s ",
2. " { M/s. ",
3. " ( S/O - ",
4. " ( W/O - "

并将输出放在R中的if语句中

dd<- data.frame(narr=c("Ratnakar:LIMITED::::CNAAJPIOP0::::Ratnakar:LIMITED",
                       "BAR-BOKALAWA:::Kl RAM I:: { M/s. REJOICE CONFECTIONARS ::BARBOKALAWA:::Kl RAM I",
                       "P2A:::REFUND::: { M/s AANCHAL SAREES :::1(NETPREM KUMAR SINGH)",
                       "P2A:: SUNDER ( S/O - JITENDER PAL ::REFUND:::::rajdhani:lawn",
                       "SAA::PRUD:::P2A::::SAA::PRUD",
                       "SAA-NOON:MOO: RAJNI ( W/O - RAM NIVAS::P2A::REFUND::SAA:NOON:MOO",
                       "CMS.CAR:::SAA:::CMS::CAR"))

This is running fine : str_detect(dd$narr, " M/s | M/s.| W/O | C/O | S/O ")


But, This is not running : str_detect(dd$narr, " { M/s | { M/s.| ( W/O | ( C/O | ( S/O ")

---

dd
？regexp
说：任何具有特殊意义的元字符都可以在前面加反斜杠引用

试试：
stringr:：stru-detect（dd$narr），“\{M/s\\{M/s\.\\.\\”（W/O（C/O）\\（s/O”）
是的，完成了，我就快到了。谢谢回复。
str_detect(dd$narr, " \\{ M/s | \\{ M/s\\.| \\( W/O | \\( C/O | \\( S/O ")

stringr::str_detect(dd$narr, " \\{ M/s | \\{ M/s\\.| \\( W/O | \\( C/O | \\( S/O ")
#[1] FALSE  TRUE  TRUE  TRUE FALSE  TRUE FALSE