Regex syntax: Difference between revisions

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Latest revision as of 08:14, 20 May 2020

This article is currently a stub; it means I'm aware it's short and I probably intend to expand on the subject in the future!

I can never remember which programs use which regex variants, so here's a quick recap sheet.


	grep (GNU)	sed (GNU)	vim	less (GNU)	python
capture	`\(` ... `\)`	`\(` ... `\)`	`\(` ... `\)`	`(` ... `)`	`(` ... `)`
option	`\\|`	`\\|`	`\\|`	`\|`	`\|`
word boundary	`\<` or `\>`	`\<` or `\>`	`\<` or `\>`	`\<` or `\>`	`\b`
zero or one	`\?`	`\?`	`\?`	`?`	`?`
zero or more	`*`	`*`	`*`	`*`	`*`
zero or more (non-greedy)			`\{-}`	(unknown)	`*?`
one or more	`\+`	`\+`	`\+`	`+`	`+`
one or more (non-greedy)			`\{-1,}`	(unknown)	`+?`

@@ Line 9: / Line 9: @@
 ! sed (GNU)
 ! vim
+! less (GNU)
 ! python
 |+
@@ Line 15: / Line 16: @@
 | <tt>\(</tt> ... <tt>\)</tt>
 | <tt>\(</tt> ... <tt>\)</tt>
+| <tt>(</tt> ... <tt>)</tt>
 | <tt>(</tt> ... <tt>)</tt>
 |+
@@ Line 21: / Line 23: @@
 | <tt><nowiki>\|</nowiki></tt>
 | <tt><nowiki>\|</nowiki></tt>
+| <tt><nowiki>|</nowiki></tt>
 | <tt><nowiki>|</nowiki></tt>
 |+
 | word boundary
+| <tt>\<</tt> or <tt>\></tt>
 | <tt>\<</tt> or <tt>\></tt>
 | <tt>\<</tt> or <tt>\></tt>
 | <tt>\<</tt> or <tt>\></tt>
 | <tt>\b</tt>
+|+
+| zero or one
+| <tt>\?</tt>
+| <tt>\?</tt>
+| <tt>\?</tt>
+| <tt>?</tt>
+| <tt>?</tt>
 |+
 | zero or more
+| <tt>*</tt>
 | <tt>*</tt>
 | <tt>*</tt>
@@ Line 39: / Line 51: @@
 |
 | <tt>\{-}</tt>
+| (unknown)
 | <tt>*?</tt>
 |+
@@ Line 46: / Line 59: @@
 | <tt>\+</tt>
 | <tt>+</tt>
+| <tt>+</tt>
+|+
+| one or more (non-greedy)
+|
+|
+| <tt>\{-1,}</tt>
+| (unknown)
+| <tt>+?</tt>
 |}
+== References ==
+* https://www.gnu.org/software/grep/manual/html_node/Regular-Expressions.html
+* http://vimregex.com/
+* https://docs.python.org/3/library/re.html
 [[Category:Programming]]
+[[Category:Cheat sheets]]