alnum_id: Generate ID strings
In xfun: Supporting Functions for Packages Maintained by 'Yihui Xie'

alnum_id

R Documentation

Generate ID strings

Description

Substitute certain (by default, non-alphanumeric) characters with dashes and remove extra dashes at both ends to generate ID strings. This function is intended for generating IDs for HTML elements, so HTML tags in the input text will be removed first.

Usage

alnum_id(x, exclude = "[^[:alnum:]]+")

Arguments

`x`	A character vector.
`exclude`	A (Perl) regular expression to detect characters to be replaced by dashes. By default, non-alphanumeric characters are replaced.

Value

A character vector of IDs.

Examples

x = c("Hello world 123!", "a  &b*^##c 456")
xfun::alnum_id(x)
xfun::alnum_id(x, "[^[:alpha:]]+")  # only keep alphabetical chars
# when text contains HTML tags
xfun::alnum_id("<h1>Hello <strong>world</strong>!")

xfun documentation built on April 3, 2025, 7:04 p.m.