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--- Regular_Expressions [2022/11/10 08:29] – [Online Primers & Tutorials] ccstone
+++ Regular_Expressions [2026/10/08 02:41] (current) – peternlewis
@@ Line 17: / Line 17: @@
 ===== Search Modifiers =====
-The ICU calls these modifiers "[[https://www.keyboardmaestro.com/action/linkthru?regularexpressionreferenceflags|flag options]]".
+The ICU calls these modifiers [[https://www.keyboardmaestro.com/action/linkthru?regularexpressionreferenceflags|flag options]].
-The search modifier "Pattern to Use" shown below is placed at the very beginning of the Search/Find Regular Expression box.\\
-For example:\\
-`(?m)^\s*\d+[\t]+`\\
-as shown in the below example #1.
 ^Purpose^Pattern to Use^Description^
@@ Line 31: / Line 27: @@
 |Word Boundaries|`(?w)`|Controls the behavior of \b in a pattern.\\ If used, word boundaries are found according to the definitions of word found in [[http://unicode.org/reports/tr29/#Word_Boundaries|Unicode UAX 29, Text Boundaries]].|
 |Comments|`(?x)`|Ignores white space and allows #comments.\\ If used, white space within regular expressions is ignored and you can use #line-comments.|
+Note that matches are **case sensitive** by default (unless the action offers an //ignores case// option), so you can use (?i) to make the regular expression case insensitive.
+The search modifier can apply to a section of the regular expression by using the form:
+```
+Case Sensitive (?i:case insensitive) Case Sensitive
+```
+of the search modifier can apply for the remainder of the pattern (unless changed later) like this:
+```
+Case Sensitive (?i)case insensitive case insensitive
+```
+or
+```
+Case Sensitive (?i)case insensitive (?-i) Case Sensitive
+```
+For example to search for the start of a line anywhere within the pattern, for the text "Hello THERE" where THERE is case insensitive you could use:
+```
+(?m)^Hello(?i:there)
+```
+Note that `(?…)` is not a Capture Group.
@@ Line 81: / Line 105: @@
 Sometimes you may need to extract a RegEx Capture Group after a match is made, and do this for multiple lines (matches) in the entire source string.  To achieve this, you need to:
-. Use the [[action:For_Each|For Each Action]] to get each match into a variable (MatchString)
+. Use the [[action:For_Each|For Each Action]] with the [[collection:Substrings_In|Substrings In]] collection to get each match into a variable (Local MatchString).
-. Then use a [[action:Search_Variable|Search Variable Action]] to get the Capture Group for that match
+. Then use a [[action:Search_using_Regular_Expression|Search using Regular Expression]] action to get the Capture Group for that match.
 Both Actions can use the same RegEx pattern.
-{{:km-for-each-regex-example.png?nolink|}}\\
-For a complete macro using this method, see:\\
+{{:km-for-each-regex-example.png?nolink|}}
-[MACRO: Get List of RegEx Capture Group of Multiple Matches](https://forum.keyboardmaestro.com/t/macro-get-list-of-regex-capture-group-of-multiple-matches/2975)
+For a complete macro using this method, see: [MACRO: Get List of RegEx Capture Group of Multiple Matches](https://forum.keyboardmaestro.com/t/macro-get-list-of-regex-capture-group-of-multiple-matches/2975)