delete_start_with is used for clean the column names in raw data.
For example, R adds "X" at the start of variable names. This function deletes
"X_"s from the column names. This can happen if the raw data have column
names such as "
its actual usage.
the pattern (a single string) to be deleted from the start.
a vector of strings with unwanted starting strings (specified by
string(s) with deleted patterns from the start.
delete_start_with("X_",c("X_hello")) delete_start_with("X_",c("X_hello","hello2")) delete_start_with("X_",c("X_hello","hello2","X_hello3"))
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