AndroBrain

Symbol	Description	Example Usage	Matches
i	Case-insensitive matching.	/hello/i on HELLO	HELLO
m	Multi-line mode (^ and $ for each line).	/^hello/m on hello\nworld	hello
s	Single-line mode (. matches newline).	/a.+c/s on a\nbc	a\nbc
g	Global matching (find all matches).	/\w+/g on hello world	hello, world
y	Sticky matching (starts at lastIndex).	/hello/y on hello	hello

AndroBrain

Symbol	Description	Example Usage	Matches
(?=...)	Positive lookahead (asserts what follows).	\w+(?=ing) on running	runn
(?!...)	Negative lookahead (asserts what doesn't follow).	\w+(?!ing) on run	run
(?<=...)	Positive lookbehind (asserts what precedes).	(?<=Mr\. )\w+ on Mr. John	John
`(?

AndroBrain

Symbol	Description	Example Usage	Matches
()	Captures a group.	(ab)+ on ababab	ababab
(?:...)	Non-capturing group.	(?:ab)+ on ababab	ababab without capturing
(?<name>...)	Named capturing group. The name can be used within the match.	(?<word>\w+) on hello	hello and names the group word
\1, \2	Backreference to a group.	(a)(b)\1 on aba	aba

AndroBrain

Symbol	Description	Example Usage	Matches
*	0 or more occurrences.	a* on aaab	aaa
+	1 or more occurrences.	a+ on aaab	aaa
?	0 or 1 occurrence.	a? on aaab	a, a, a
{n}	Exactly n occurrences.	a{2} on aaa	aa
{n,}	n or more occurrences.	a{2,} on aaa	aaa
{n,m}	Between n and m occurrences.	a{2,3} on aaa	aa, a

AndroBrain

Symbol	Description	Example Usage	Matches
^	Start of a string.	^a\d on a1 a2 a3	a1
$	End of a string.	a\d$ on a1 a2 a3	a3
\b	Word boundary.	\bword\b on wordplay	word only
\B	Non-word boundary.	\Bword\B on password	word within password

AndroBrain

Symbol	Description	Example Usage	Matches
.	Character except newline (\n).	a.b on aab, acb	aab, acb
\d	Digit (0-9).	\d+ on abc123	123
\D	Non-digit character.	\D+ on abc123	abc!
\w	Word character (alphanumeric + _).	\w+ on _hello123!@	_hello123
\W	Non-word character.	\W+ on abc!@#123	!@#
\s	Whitespace character.	\s+ on hello world	Space between hello and world
\S	Non-whitespace character.	\S+ on hello world	hello, world

AndroBrain

fun showExternalAppPicker(context: Context, uri: Uri) {
    val intent = Intent(Intent.ACTION_VIEW, uri)
    // Get all matching apps
    val matchingExternalApps = context.packageManager.queryIntentActivities(
      intent,
      PackageManager.MATCH_DEFAULT_ONLY,
    )
    displayExternalApps(context, matchingExternalApps)
}

AndroBrain

val geoUrl = "geo:37.7749,-122.4194"
val intent = Intent(Intent.ACTION_VIEW, Uri.parse(geoUrl))
context.startActivity(intent)

AndroBrain

fun openExternalApp(context: Context, uri: Uri) {
    val intent = Intent(Intent.ACTION_VIEW, uri)
    context.startActivity(intent)
}

AndroBrain

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.INTERNET" />

    <!-- Add this only if you're working with http and use it only in debug builds -->
    <application
        android:usesCleartextTraffic="true">
        ...