Regular Expressions - Revision history

Admin at 19:12, 20 December 2018

2018-12-20T19:12:29Z

@@ Line 56: / Line 56: @@
 <code> ^^ </code> &nbsp; &nbsp; "^" at the beginning of a line<br />
 <code> $$ </code> &nbsp; &nbsp; "$" at the end of a line<br />
 == References ==

Admin: /* Anchor Characters */

2017-01-10T22:31:59Z

Anchor Characters

← Older revision		Revision as of 22:31, 10 January 2017
Line 48:		Line 48:
	Note that ^ and $ are only anchors if the are used at the start (^) or end ($) of a pattern.		Note that ^ and $ are only anchors if the are used at the start (^) or end ($) of a pattern.

	'''Examples:'''		'''Examples:''' <br />
	Pattern Matches<br />		Pattern Matches<br />
	<code> ^A </code>     "A" at the beginning of a line<br />		<code> ^A </code>     "A" at the beginning of a line<br />

Admin: /* Anchor Characters */

2017-01-10T22:31:46Z

Anchor Characters

← Older revision		Revision as of 22:31, 10 January 2017
Line 50:		Line 50:
	'''Examples:'''		'''Examples:'''
	Pattern Matches<br />		Pattern Matches<br />
	<code> ^A </code> "A" at the beginning of a line<br />		<code> ^A </code>     "A" at the beginning of a line<br />
	<code> A$ </code> "A" at the end of a line<br />		<code> A$ </code>     "A" at the end of a line<br />
	<code> A^ </code> "A^" anywhere on a line<br />		<code> A^ </code>     "A^" anywhere on a line<br />
	<code> $A </code> "$A" anywhere on a line<br />		<code> $A </code>     "$A" anywhere on a line<br />
	<code> ^^ </code> "^" at the beginning of a line<br />		<code> ^^ </code>     "^" at the beginning of a line<br />
	<code> $$ </code> "$" at the end of a line<br />		<code> $$ </code>     "$" at the end of a line<br />


	== References ==		== References ==

Admin at 22:29, 10 January 2017

2017-01-10T22:29:50Z

@@ Line 42: / Line 42: @@
 <code>\</code> - escapes a special character. For example, if you want to see if a file has a question mark in it, you can't use the question mark symbol because it has a special meaning. So, we escape (tell regex to ignore it's special meaning and treat it as a literal character) it by putting a backslash in front of it. Like this: <code> \? </code>
@@ Line 49: / Line 63: @@
      <li>[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]</li>
      <li>[http://www.regular-expressions.info/ Regular Expressions Info]</li>
 </ol>

Admin at 03:15, 23 December 2016

2016-12-23T03:15:02Z

← Older revision		Revision as of 03:15, 23 December 2016
Line 12:		Line 12:
	== Cheat Sheet ==		== Cheat Sheet ==

	a - Literal character, like the letter, "a". Every character is literal except these twelve: <code> \ ^ </code>		a - Literal character, like the letter, "a". Every character is literal except these twelve: <code> \ ^ $ . \| ? * + ( ) [ { </code>

	<code>.</code> (dot) - a single character.		<code>.</code> (dot) - a single character.
Line 41:		Line 41:

	<code>\</code> - escapes a special character. For example, if you want to see if a file has a question mark in it, you can't use the question mark symbol because it has a special meaning. So, we escape (tell regex to ignore it's special meaning and treat it as a literal character) it by putting a backslash in front of it. Like this: <code> \? </code>		<code>\</code> - escapes a special character. For example, if you want to see if a file has a question mark in it, you can't use the question mark symbol because it has a special meaning. So, we escape (tell regex to ignore it's special meaning and treat it as a literal character) it by putting a backslash in front of it. Like this: <code> \? </code>

Admin at 03:11, 23 December 2016

2016-12-23T03:11:16Z

@@ Line 1: / Line 1: @@
-A regular expressions is a standard way of using text to form a search to match patterns.
+A regular expression (or regex for short) is a standard way of using text to form a search to match patterns.
 Similar to using an asterisk like this: <code>*.jpg</code> in a search box to find all JPEG files, you can use a regular expression (along with something like [[grep]]) to match much more complex patterns.
@@ Line 8: / Line 8: @@
 to search for any e-mail addresses in a file
 == Cheat Sheet ==

Admin at 02:42, 23 December 2016

2016-12-23T02:42:36Z

@@ Line 1: / Line 1: @@
-Coming soon...
+A regular expressions is a standard way of using text to form a search to match patterns.
@@ Line 6: / Line 18: @@
 <ol>
      <li>[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]</li>
 </ol>

Admin: Created page with "Coming soon... == References ==

[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]

"

2016-12-22T01:11:08Z

Created page with "Coming soon... == References == <ol> <li>[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]</li> </ol>"

New page

Coming soon...

== References ==

<ol>
<li>[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]</li>
</ol>

Regular Expressions - Revision history

Admin at 19:12, 20 December 2018

Admin: /* Anchor Characters */

Admin: /* Anchor Characters */

Admin at 22:29, 10 January 2017

Admin at 03:15, 23 December 2016

Admin at 03:11, 23 December 2016

Admin at 02:42, 23 December 2016

Admin: Created page with "Coming soon... == References == [http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions] "

Admin: Created page with "Coming soon... == References ==

[http://ryanstutorials.net/linuxtutorial/grep.php Ryan's Tutorials Grep and Regular Expressions]

"