Grep(), grepl(): These functions search for matches of a regular expression/pattern in a character vector. The primary R functions for dealing with regular expressions are 22.4 Example: Bootstrapping a Statistic.21.3.2 Changes in PM levels at an individual monitor.21.2 Loading and Processing the Raw Data.21 Data Analysis Case Study: Changes in Fine Particle Air Pollution in the U.S.15.3 Lexical Scoping: Why Does It Matter?.15.1 A Diversion on Binding Values to Symbol.12.3.1 Common dplyr Function Properties.12 Managing Data Frames with the dplyr package.9.5 Extracting Multiple Elements of a List.9.4 Subsetting Nested Elements of a List.7 Using Textual and Binary Formats for Storing Data.5.4 Calculating Memory Requirements for R Objects.5.3 Reading in Larger Datasets with read.table.
5.2 Reading Data Files with read.table().3.2 Getting started with the R interface.Or git grep -E 'buildLabel\("+"\)', the unescaped + is a quantifier in POSIX ERE. The git grep -e 'buildLabel\("*"\)' is the same POSIX BRE, to make it a POSIX ERE, you need to use the -E option, git grep -E 'buildLabel\("*"\)'. The git grep 'buildLabel\("+"\)' does not work because \(.\) (escaped pair of parentheses) define a capturing group and do not thus match literal parentheses. If it is a GNU grep, you could use git grep 'buildLabel("\+")' (not sure it works with git). You can use git grep 'buildLabel("\")' in POSIX BRE though. In git grep 'buildLabel("+")', you are using the POSIX BRE regex, and + is parsed as a literal + char, not as a one or more quantifier. it should be git grep -P "buildLabel\(\"\w+\"\)". In your git grep -P "buildLabel(\"\w+\")", the parentheses must be escaped in order to be matched as literal parentheses, i.e. You can enable PCRE regex syntax with -P option, and in that case you should refer to PCRE documentation. Use fixed strings for patterns (don’t interpret pattern as a regex). To make git grep treat the pattern as a fixed string you need -F: -F So, by default, git grep treats the pattern string as a POSIX BRE regex, not as a fixed string. Use POSIX extended/basic regexp for patterns. So what am I doing wrong with git grep? Or is it broken?įYI: I am using git version 2.35.1 from Homebrew on macOS Big Sur. $ git grep 'buildLabel\("*"\)' (in case + isn't implemented) Thanks to commenting that with PCRE the parens need to be escaped (I am always confused by that). I also tried changing the quote characters and got the same results.
GREP WITH REGULAR EXPRESSION CODE
That returned the instance in the code that I already knew existed.
I verified that I could search with a fixed string.
So I tried it without the Perl extension. I am very familiar with regular expressions and I see that git grep supports Perl character classes. The correct call should be: JLabel label = buildLabel(getString("Alphabet")) So I would like to search my code for uses of these methods without a lookup for the localized string.
There are also buildBoldLabel(), buildMultiLineLabel(), and buildTextArea(). In this case buildLabel() is an inherited utility method. For example: JLabel label = buildLabel("Alphabet") I have places in the code with non-localized strings. I have used git grep for years to search for fixed strings and haven't used it much for doing regular expression searches.
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