gadenbuie / regexplain Goto Github PK

When hitting "Send Regex To Console" in the Output tab, the console shows something like the following:

pattern <- "\w+ " # perl=TRUE
replacement <- "NO "

Wouldn't be better to integrate the parameters into the actual function used? In this case, it could translate into:

sub(pattern = "\w+",
replacement = "NO ",
x = readr::read_file("LICENSE"),
perl = TRUE)

Or maybe:

sub(pattern = "\w+",
replacement = "NO ",
x = YOUR_CHARACTER_VECTOR_HERE,
perl = TRUE)

Thanks for the awesome package!

Trying to use regexplain via the addin or any of the functions in the package gives the same error indicating %AND% not found.

Per our separate conversation offline, it sounds like this may be relying on a shiny component that has now changed.

regexplain::regexplain_web(text = "https://cms.nhl.bamgrid.com/images/headshots/current/168x168/8478402.jpg", pattern = ".*[/]([^.]+)[.].*")
#> Error in get(x, envir = ns, inherits = FALSE): object '%AND%' not found

^{Created on 2021-01-27 by the reprex package (v0.3.0)}

Test: "(?:The )?([^ ]+) (?:is|was|were) ([^ ]+) (([^ ]+) (([^ ]+) ([^ ]+)))"

Should not look like this (note green and red non-capture groups)

The gadget currently accepts text input via regexplain::regex_gadget(text). This works well for the addin where the current selection is passed to the gadget.

In working with a regexp, I often cycle between the source and the gadget, and it would be useful to be able to pass a regexp to the gadget as well, i.e. regexplain::regex_gadget(text, pattern).

As described in #9, there may be an issue coming up with R Studio version 1.2

As a possible related issue I have not succeeded in copying a regex with the send RegEx to Console button. The regexplain applet (?) just ends without visible indication that a copy is done (to console, editor or clipboard).
This happens even when I try to change '2017' in '2018' with gsub with the applet: in this case the RegEx and Output panel both show the expected display but the send RegEx to Console button only ends the applet.

I am using RStudio Version 1.2.502 and R packages as listed below in sessionInfo.

• Offload screencast gifs to personal website or website repo
• Optimize pngs
• Clean up other big files?

The gadget currently shows the first match in each line akin to sub() because this is how regexc() works.

A global search option would be great, most likely by adding logic to remove the first match and re-run regexc() on the remaining string.

Only the "Cheatsheeth" does launch despite the error message

regexplain:::regexplain_addin()
Error in get(x, envir = ns, inherits = FALSE) : object '%AND%' not found

RStudio
Version 1.4.1103

MacBook-Air M1
r --version
R version 4.0.3 (2020-10-10) -- "Bunny-Wunnies Freak Out"
Copyright (C) 2020 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin17.0 (64-bit)

Pretty sure that stringi, stringr and rematch2 can be in suggests. Either the gadget takes into account whether these functions are loaded or it should.

Hi!

Though I like any initiative to make regular expressions more convenient to use, I find most solutions to lack a visual understanding of the regex itself. Textual explanations of regular expressions don't really cut it IMHO. Probably the best source for visualising regex is Debuggex, which is unfortunately down with a gateway error half of the time. Would it be possible to include (something similar to) their awesome visual graphic as perhaps a new tab to your interface?

What I mean is this:

# example regex for validating email adresses, quite hard to read
^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$

Output by Debuggex (which is mainly powered by their static/js/main.js):

If you want to replace or extract, say, the domain, you can immediately tell that you're looking for group 2 (\\2). Might be obvious in this case, but for more complex expressions, this really matters and can save a lot of time.

How awesome would it be, if your Shiny app could convert this:

# example regex for matching IP addresses
^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$

into this:

😄

Needs more investigation, but I think I only use dplyr and tidyr in a one or two places and can easily refactor to remove them as dependencies. See #9 for a reason why this would be a good idea (dplyr imports other packages, etc.).

Using rocker/verse c97e22aa5090 (I think), I get the following error

> view_regex(stringr::sentences[1:10], "(?:The )?([^ ]+) (?:is|was|were) ([^ ]+) (([^ ]+) (([^ ]+) ([^ ]+)))")
pandoc: theme:bootstrap: openFile: does not exist (No such file or directory)
Error: pandoc document conversion failed with error 1

Hello Garrick,

just to let you know that this link:
https://apps.garrickadenbuie.com/regexplain
is error 502.

Thanks again for all the development you do, appreciate all your pkgs.

or drop the tidyr dependency

To reproduce:

• Set text and pattern
• View str_replace so that replacement input is generated
• Leave replacement blank
• Click "Send to console"
• Get error:

Warning: Error in if: missing value where TRUE/FALSE needed
Stack trace (innermost first):
    68: observeEventHandler
     4: shiny::runApp
     3: runGadget
     2: regex_gadget
     1: regexplain:::regexplain_addin
ERROR: [on_request_read] connection reset by peer

Should be quick fix to check that input$replacement is truthy.

Packages and resources

• vignettes("regular-expressions", "stringr")
• R4DS
• tidy text mining
• RStudio RegEx CheatSheet
• Awesome RegEx

Online RegEx previews

• https://regexr.com
• https://www.debuggex.com/
• https://regex101.com/
• https://www.regexbuddy.com/ 💰
• http://www.mactechnologies.com/index.php?page=downloads#regexrx

Other regex and string related packages:

• https://stringr.tidyverse.com
• https://github.com/trinker/regexr
• https://github.com/kevinushey/rex
• https://github.com/richierocks/rebus

Other R/Shiny/Rstudio related packages:

• https://spannbaueradam.shinyapps.io/r_regex_tester/

Experimenting with the toolbox I tried to change text between parentheses. A pair of parentheses without any text in between is not handled correctly in the RegEx panel. However the Output panel shows the expected output. See end of this post.

As a possible related issue I have not succeeded in copying a regex with the send RegEx to Console button. The regexplain applet (?) just ends without visible indication that a copy is done (to console, editor or clipboard).
This happens even when I try to change '2017' in '2018' with gsub with the applet: in this case the RegEx and Output panel both show the expected display but the send RegEx to Console button only ends the applet.

I am using RStudio Version 1.2.502 and R packages as listed below in sessionInfo.

Thanks for bringing this software to the public domain.

RegEx panel:

Output panel:

sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods
[7] base

other attached packages:
[1] shiny_1.0.5 bindrcpp_0.2.2

loaded via a namespace (and not attached):
[1] Rcpp_0.12.16 rstudioapi_0.7 bindr_0.1.1
[4] magrittr_1.5 tidyselect_0.2.4 xtable_1.8-2
[7] R6_2.2.2 rlang_0.2.0 dplyr_0.7.4
[10] tools_3.4.1 miniUI_0.1.1 htmltools_0.3.6
[13] yaml_2.1.18 assertthat_0.2.0 digest_0.6.15
[16] tibble_1.4.2 regexplain_0.2.1 tidyr_0.8.0
[19] purrr_0.2.4 curl_3.1 glue_1.2.0
[22] mime_0.5 compiler_3.4.1 pillar_1.2.1
[25] jsonlite_1.5 httpuv_1.3.6.2 pkgconfig_2.0.1

The default branch of this repository is being moved from master to main. This issue will be closed when the default branch has been changed.

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^{ID: 91e77a361e4e}

Test: "(?:The )?([^ ]+) is|was|were ([^ ]+) (([^ ]+) (([^ ]+) ([^ ]+)))"

Should not look like this:

Maybe because regexec returns something like this:

[[4]]
[1] 22 22  0  0  0  0  0  0
attr(,"match.length")
[1] 6 3 0 0 0 0 0 0
attr(,"useBytes")
[1] TRUE

[[5]]
[1] 1 1 0 0 0 0 0 0
attr(,"match.length")
[1] 7 4 0 0 0 0 0 0
attr(,"useBytes")
[1] TRUE

Or is the regex fundamentally wrong?

After installing regexplain the following packages were deleted from my machine:

• rlang
• yaml
• Rcpp
• tidyselect
• stringi

Very odd behavior.