regexregex-group
Regex: why is numeric capturing after negative lookahead not working?
(.)(?!\1)\1
I think this should match any character [c], followed by any character that is not [c], then followed by [c] again.
like 'aba', 'xyx'
But online regexr validator is telling me im wrong. Where is the issue?
Thanks in advance.
Solution
You were correctly checking if the second character isn't the same as the first (group), but you forgot to allow a match on the second character otherwise.
(.)(?!\1).\1
https://regex101.com/r/vvapcB/1
If you want to also want the matches to be 3 characters only,
(?=.{3}$)(.)(?!\1).\1
- Order() in R - argument is missing, with no default
- How to plot geom_bar without showing multiple lines
- R: speeding up "group by" operations
- How to manipulate NetCDF-4 groups in R?
- How to convert categorial raster to mapped RGB values in R?
- How to add a hover-over tooltip to rhandonstable header cell?
- How to detect the right encoding for read.csv?
- Rcpp Rf_warningcall compiler warnings
- Modify the name of factor variables in lm function(summary function)
- Extreme value analysis and quantile estimation using log Pearson type 3 (Pearson III) distribution - R vs Python
- How to hide NAs when using xlsx::saveWorkbook?
- How do I retrieve a simple numeric value from a named numeric vector in R?
- Adding an image in navbar and adjusting alignment in Rmarkdown
- Matching pair-wise columns from left to right across rows in one dataframe to another dataframe and adding new columns with matching values
- Income to outcome flow chart in Sankey plotly R
- color mapping in geom_conn_bundle not showing correctly
- Print R package startup message AFTER automatic package conflict messages instead of before
- Summing a set of R dataframe rows (column-wise), while retaining the first n columns
- Added variable / partial regression plots for groups in an interaction?
- how to make a topoplot in R with coordinates variable distribution
- List of all functions in base R?
- Plotting multiple plots for different initial conditions in one graph
- Printing repetitively on the same line in R
- Generating UI/Server based on initial selection
- Subset dataframe based on pickerInput
- How to let user pick the data in R-shiny?
- Couldn't show my simple bar charts separately on Shiny R dashboardBody
- How to programmatically filter contents of a second shiny app displayed via iframe
- How to select specific interesting groups for the boxplot in R Shiny app?
- Crosstable and Plot grouping with reactive values