regexr 0.0.2

Test Regular Expression Validity

Usage

test(x, quiet, ...)

Arguments

x
A regexr object.
quiet
logical. Should test print warnings about the concatenated expression and individual chunks?
...
Ignored.

Test Regular Expression Validity

Value

Returns a list of two logical vectors. The first vector is a test of the concatenated expression. The second vector is a logical test of the validity of each regular expression chunk that makes up the concatenated expression.

Description

Test regular expression validity of a regexr object.

Examples

m <- construct(
    space =
        "\\s+"
            %:)%"I see",

    simp =
        "(?<=(foo))",

    or =
        "(;|:)\\s*"
            %:)%"comment on what this does",

    "[a]s th[atey]"
)


test(m)



$regex
[1] TRUE

$chunks
space  simp    or       
 TRUE  TRUE  TRUE  TRUE 





regex(m)[5:7] <- c("(", "([A-Z]|(\\d{5})", ")")
test(m)


Warning message:
The concatenated regex is not valid

\s+(?<=(foo))(;|:)\s*[a]s th[atey](([A-Z]|(\d{5}))

Warning message:
The following regex chunks are not valid in isolation:

(1) (
(2) ([A-Z]|(\d{5})
(3) )

$regex
[1] FALSE

$chunks
space  simp    or                         
 TRUE  TRUE  TRUE  TRUE FALSE FALSE FALSE