Differences

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--- system:regex:regex_notation [2018/04/13 11:10]
smayr [Using Regex in PHP]
+++ system:regex:regex_notation [2018/04/13 11:52] (current)
smayr [Regex Quick Reference]
@@ Line 8: / Line 8: @@
 | [a-zA-Z]     | Any single character in the range a-z or A-Z |
 | <nowiki>^</nowiki>            | Start of line |
-| $            | End of line |
-| \A           | Start of string |
-| \z           | End of string |
 | .            | Any single character |
 | \s           | Any whitespace character |
@@ Line 18: / Line 15: @@
 | \w           | Any word character (letter, number, underscore) |
 | \W           | Any non-word character |
-| \b           | Any word boundary character |
 | (...)        | Capture everything enclosed |
 | (a<nowiki>|</nowiki>b)        | a or b |
@@ Line 28: / Line 24: @@
 | a{3,6}       | Between 3 and 6 of a |
-Options:
+General Tokens:
+^ Symbol       ^ Description ^
+| \n           | Newline |
+| \r           | Carriage return |
+| \t           | Tab |
+| \f           | Form-feed |
+| \0           | Null character |
+Anchors:
+^ Symbol       ^ Description ^
+| \G           | Start of match |
+| <nowiki>^</nowiki>            | Start of string |
+| \A           | Start of string |
+| $            | End of string |
+| \Z           | End of string |
+| \z           | Absolute end of string |
+| \b           | Any word boundary character |
+| \B           | Any non-word boundary |
+| \w           | Any word character (letter, number, underscore) |
+| \W           | Any non-word character |
+Flags/Modifiers (eg: "/regex here.../g"):
+^ Symbol       ^ Description  ^
+| g  | Global (do not return after first match) |
 | i  | Case insensitive |
-| m  | Make dot match newlines  |
+| m  | Multiline (dot matches newlines, <nowiki>^</nowiki> and $ match start/end of line)  |
-| x  | Ignore whitespace in regex |
+| s  | Single line (dot matches newline) |
+| u  | Unicode (match with full unicode) |
+| x  | eXtended (ignore whitespace) |
+| X  | eXtra (disallow meaningless excapes|
 | o  | Perform #{...} substitutions only once |
+| A  | Anchored (anchor to start of pattern) |
+| J  | Duplicate group names (allow duplicate subpattern names) |
+| D  | Dollar end only ($ matches only end of pattern) |
 == Using Regex in PHP ==
@@ Line 59: / Line 84: @@
 Example using ''preg_replace()'':
 <code php>
+// Strip ending commas
+$str = preg_replace('/,$/s', '', $str);
 // Strip leading/trailing commas with whitespace around
 $str = preg_replace('/^[,\s]+|[\s,]+$/', '', $str);
 </code>
+== References ==
+  * [[http://www.rexegg.com/regex-quickstart.html|Regex Cheat Sheet]]
+  * [[https://regex101.com|Regex 101]]