r - Remove unwanted hyphen from variable -


i have data below 

0-0098-45.3a-22 0-0104-44.0a-23 0-0983-29.1-22 0-1757-42.5a-22 0-4968-37.3a2-23 000000-44.0a-23 000000-45.3a-42

is there way remove initial unwanted hypen , make below in r

00098-45.3a-22 00104-44.0a-23 00983-29.1-22 01757-42.5a-22 04968-37.3a2-23 000000-44.0a-23 000000-45.3a-42

any helpful.

we can use sub remove unwanted - @ 2nd position of string. use ^ specify start of string, capture first character group ((.) - . metacharacter refers character element) followed - , in replacement use backreference (\\1) captured group.

df$v1 <- sub('^(.)-', '\\1', df$v1) df$v1 #[1] "00098-45.3a-22"  "00104-44.0a-23"  "00983-29.1-22"    #[4] "01757-42.5a-22"  "04968-37.3a2-23" "000000-44.0a-23" "000000-45.3a-42"

data

df <- structure(list(v1 = c("0-0098-45.3a-22", "0-0104-44.0a-23", "0-0983-29.1-22",  "0-1757-42.5a-22", "0-4968-37.3a2-23", "000000-44.0a-23", "000000-45.3a-42" )), .names = "v1", class = "data.frame", row.names = c(na, -7l))

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