Compile a Glycan Regular Expression

Compile a reusable structural query. Patterns run from the non-reducing end towards the reducing end; they are not text regular expressions.

Usage

rex_compile(pattern)

Arguments

pattern

One non-missing pattern string, or a compiled pattern.

Value

A glyrex_pattern containing a parsed syntax tree and capture names.

Details

Compilation validates the pattern syntax and prepares it for reuse with query functions such as rex_detect() and rex_extract(). Passing an already compiled pattern returns it unchanged.

See also

vignette("glyco-regex-syntax", package = "glyrex") for a step-by-step guide to pattern syntax. See rex_detect() for matching and result conventions.

Examples

p <- rex_compile("Galb4-(Fuca3-)GlcNAc")
rex_detect("Gal(b1-4)[Fuc(a1-3)]GlcNAc", p)
#> [1] TRUE
rex_detect(c("GlcNAc(a1-", "GlcNAc(b1-"), "GlcNAca$")
#> [1]  TRUE FALSE