1.正则表达式概述 正则表达式又称正规表示式、正规表示法、正规表达式、规则表达式、常规表示法(英语:Regular Expression,在代码中常简写为regex、regexp或RE),计算机科学的一个概念。正则表达式使用单个字符串来描述、匹配一系列符合某个句法规则的字符串。在很多文本编辑器里,正则表达式通常被用来检索、替换那些符合某个模式的文本。
例如，*将与*匹配，而不意味着0 or 1重复。同样，()将与(和)相匹配，而不会创建capture group。
Replacements are aware of variables, which are made accessible for use through regex capture groups. Capture groups can be numbered, or optionally named. The zeroth capture group corresponds to the entire match. $ echo 'Swap It' | srgn '(\w+) (\w+)' '$2 $1' # Regular, numbered It ...
--no-group-separator suppress separators between groups of lines -O, --output=text show only this text (possibly expanded) -o, --only-matching=n show only the part of the line that matched --om-separator=text set separator for multiple -o output --om-capture=n set capture count for ...
Note that multiple line modifier (m) is set when executed, so put (?-m) at the beginning of regex if you want to explicitly disable it.Order of capture group in the pattern is not guaranteed. Please avoid to use direct index, and use relative or named capture group instead. For ...
(cd $srcdir; $valgrind $vjs $pcre2grep -m1MK -o1 --om-capture=0 'pattern()()()()' testdata/grepinput) >>testtrygrep 2>&1 echo "RC=$?" >>testtrygrep (cd $srcdir; $valgrind $vjs $pcre2grep --max-count=1MK -o1 --om-capture=0 'pattern()()()()' testdata/grepin...
Another valid approach for the second question, using similar variations on the theme and a capture group on XYZ: (?:[[:alpha:]]+)(xyz|XYZ)(?:[[:alpha:]]+) (?i)(?:[[:alpha:]]+)(xyz)(?:[[:alpha:]]+) (?:\w+)(xyz|XYZ)(?:\w+) (?i)(?:\w+...
我有一个大的二进制文件。我想从其中提取某些字符串并将它们复制到一个新的文本文件中。 例如,在: 代码语言:javascript 运行 AI代码解释 D-wM-^?^@^@^@^@^@^@^@^Y^@^@^@^@^@^@^@M-lM-FM-MM-[o@^B^@M-lM-FMMM-[o@^B^@^@^@^@^@E7cacscKLrrok9bwC3Z64NTnZM-^G ...
Your regex seems to imply that you'd take any two or three digit number, right? (?<=\.|-)(\d{2,3})(?!\d) First: a positive lookbehind, "capture anything that follows a literal period or a dash". Then: a group of "any two or three digits". Followed by: a negative ...
Nevertheless, we've put considerable time and effort into optimising regex search performance capturing groups. If you're using brackets for grouping, but really don't need to capture, use a non-capturing group instead, for example "(?:fred)" instead of "(fred)". When I select an ...