/\cthis matches 'this', 'This', 'thiS', etc.
\V no need to use \ when trying to match special characters s/\v(\d+) (\d+)/\2 \1/ swap two numbers separated by space./\vhand(y|ful) match 'handy' or 'handful'./\v match whole word 'his', not 'this' or 'history'./\vabc? match 'ab' or 'abc' but not 'abcc'./\vabc+ match 'abc' or 'abccc' but not 'ab'.\v helps to avoid \ for pattern qualifiers, grouping pattern, etc /\ matches 'his' and not 'this' or 'history'.\ Bind the searchpattern to exactly match whole word.w+ matches 1 or more word characters (same as a-zA-Z0-9+ ). /his\> matches 'his' and 'this' but not 'history' The position anchors and match the beginning and the ending of the input string, respectively.\ Bind the searchpattern to necessarily be ending characters of a word./hand\(y\|ful\) match 'handy' or 'handful'.\(pattern\) allows to group matched patterns and use special variables \1, \2, etc to represent them in same searchpattern and/or replacestring when using substitute command.The regex above also matches multiple consecutive new lines.
REGEX BEGINNING OF LINE WINDOWS
Note that Linux uses for a new-line, Windows \r, and old Macs \r. \| allows to specify two or more patterns to be matched A regular expression to match a new line (linebreaks).\r used in replacestring to insert a newline character.\t used in replacestring to insert a Tab character.\S matches other than white-space characters.\s matches white-space characters space and tab.\W match other than alphanumeric character or underscore.\w matches any alphanumeric character or underscore.\U matches other than uppercase alphabets.\L matches other than lowercase alphabets.Since this token is a zero-length token, the engine. The first token in the regular expression is. \a matches alphabet character, short-cut for As usual, the regex engine starts at the first character: 7.match any character other than 'a' or 'b' or 'c' or 'd' or 'e'.match any of 'a' or 'b' or 'c' or 'd' or 'e' ONE time./abc\? match 'ab' or 'abc' but not 'abcc'.\? match preceding character 0 or 1 times ( \= can also be used)./abc\+ match 'abc' or 'abccc' but not 'ab'.\+ greedy match preceding character 1 or more times./abc* match 'ab' or 'abc' or 'abccc' or 'abcccccc' etc.*greedy match preceding character 0 or more times./c.t match 'cat' or 'cot' or 'c2t' or 'c^t' but not 'cant'.match any single character, excluding new line Regular Expressions Anchor Characters: Caret () Start of Line Example When multi-line (m) modifier is turned off, matches only the input strings. $ match pattern should terminate at end of a line./^This match This only at beginning of line.^ start matching from beginning of a line.s/cat/Dog/gi replace every occurrence of cat (ignoring case, so it matches Cat, cAt, etc) with Dog (note that i doesn't affect the replacement string Dog).c ask for confirmation before each replacement.
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