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--- cheat_sheets_regex [2022/09/25 14:31] – gman
+++ cheat_sheets_regex [2023/02/11 14:34] (current) – [Groups and Ranges] gman
@@ Line 48: / Line 48: @@
 |  [A-Q]       | Upper case letter from A to Q      |
 |  [0-7]       | Digit from 0 to 7                  |
+Use a group to "capture and replace".
+  * ''a(bc)'' parentheses create a capturing group with value ''bc''
+  * The parentheses are used to create "groups," which then get assigned a base-1 index, accessible in a //replace// with a ''$'' (i.e., the first parentheses-bounded (characters) become a group that can be referenced by ''$1'', the second group would be ''$2'', the third ''$3'', etc.).
+  * NOTE: in **gedit** you reference with a backslash: ''\'' not a ''$'' (i.e., ''\1\2\3'', etc.).
+  * See the follow table regarding **string replacements**.
 ----
@@ Line 53: / Line 59: @@
 ===== String Replacement =====
-^  Syntax      ^ Description       ^
+^  Syntax      ^ Description           ^
-|  $n  | nth non-passive group     |
+|  $n  | nth non-passive group         |
-|  $2  | "xyz" in /^(abc(xyz))$/   |
+|  $2  | %%"xyz" in /^(abc(xyz))$/%%   |
-|  $1  | "xyz" in /^(?:abc)(xyz)$/ |
+|  $1  | %%"xyz" in /^(?:abc)(xyz)$/%% |
-|  $`  | Before matched string     |
+|  $`  | Before matched string         |
-|  $'  | After matched string      |
+|  $'  | After matched string          |
-|  $+  | Last matched string       |
+|  $+  | Last matched string           |
-|  $&  | Entire matched string     |
+|  $&  | Entire matched string         |
 **Note:** Some regex implementations use \ instead of $.
@@ Line 98: / Line 104: @@
 |  [:word:]    | Digits, letters and underscore |
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+----