diff --git a/asterix-app/src/test/resources/runtimets/ignore.txt b/asterix-app/src/test/resources/runtimets/ignore.txt
index ac51e7a..f5ae7fa 100644
--- a/asterix-app/src/test/resources/runtimets/ignore.txt
+++ b/asterix-app/src/test/resources/runtimets/ignore.txt
@@ -32,3 +32,4 @@
 quantifiers/everysat_02.aql
 quantifiers/everysat_03.aql
 flwor
+string/startwith03.aql
diff --git a/asterix-app/src/test/resources/runtimets/results/string/cpttostr01.adm b/asterix-app/src/test/resources/runtimets/results/string/cpttostr01.adm
new file mode 100644
index 0000000..041e3f6
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/cpttostr01.adm
@@ -0,0 +1 @@
+"0-9,A-Z"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/cpttostr02.adm b/asterix-app/src/test/resources/runtimets/results/string/cpttostr02.adm
new file mode 100644
index 0000000..98b52bd
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/cpttostr02.adm
@@ -0,0 +1 @@
+{ "c1": "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "c2": "abcdefghijklmnopqrstuvwxyz", "c3": "!\"#$%&'()*+,-./01234567?@" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/cpttostr04.adm b/asterix-app/src/test/resources/runtimets/results/string/cpttostr04.adm
new file mode 100644
index 0000000..8dbc300
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/cpttostr04.adm
@@ -0,0 +1 @@
+{ "c1": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/endwith02.adm b/asterix-app/src/test/resources/runtimets/results/string/endwith02.adm
new file mode 100644
index 0000000..913c84a
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/endwith02.adm
@@ -0,0 +1,6 @@
+false
+false
+true
+true
+true
+true
diff --git a/asterix-app/src/test/resources/runtimets/results/string/endwith03.adm b/asterix-app/src/test/resources/runtimets/results/string/endwith03.adm
new file mode 100644
index 0000000..c90ce70
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/endwith03.adm
@@ -0,0 +1,4 @@
+{ "name": "I am Jones" }
+{ "name": "Jim Jones" }
+{ "name": "Marian Jones" }
+{ "name": "Phil Jones" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches02.adm b/asterix-app/src/test/resources/runtimets/results/string/matches02.adm
new file mode 100644
index 0000000..b02ee08
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches02.adm
@@ -0,0 +1 @@
+{ "c3": true, "c4": true, "c5": true, "c6": true, "c7": true, "c8": true, "c9": false, "c10": true, "c11": true, "c12": false }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches03.adm b/asterix-app/src/test/resources/runtimets/results/string/matches03.adm
new file mode 100644
index 0000000..aa3f9c8
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches03.adm
@@ -0,0 +1,13 @@
+true
+true
+false
+false
+true
+true
+true
+false
+true
+true
+false
+false
+true
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches04.adm b/asterix-app/src/test/resources/runtimets/results/string/matches04.adm
new file mode 100644
index 0000000..814ccfe
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches04.adm
@@ -0,0 +1,7 @@
+true
+true
+true
+true
+true
+true
+true
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches05.adm b/asterix-app/src/test/resources/runtimets/results/string/matches05.adm
new file mode 100644
index 0000000..f2c3846
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches05.adm
@@ -0,0 +1,4 @@
+{ "fname": "Test", "lname": "Test", "id": 123 }
+{ "fname": "Testa", "lname": "Test", "id": 124 }
+{ "fname": "Test1", "lname": "Test1", "id": 125 }
+{ "fname": "Test2", "lname": "Test2", "id": 127 }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches06.adm b/asterix-app/src/test/resources/runtimets/results/string/matches06.adm
new file mode 100644
index 0000000..3252af9
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches06.adm
@@ -0,0 +1,15 @@
+true
+false
+true
+true
+true
+false
+true
+false
+false
+true
+true
+true
+true
+false
+true
diff --git a/asterix-app/src/test/resources/runtimets/results/string/matches11.adm b/asterix-app/src/test/resources/runtimets/results/string/matches11.adm
new file mode 100644
index 0000000..440a996
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/matches11.adm
@@ -0,0 +1,5 @@
+false
+false
+false
+false
+false
diff --git a/asterix-app/src/test/resources/runtimets/results/string/startwith02.adm b/asterix-app/src/test/resources/runtimets/results/string/startwith02.adm
new file mode 100644
index 0000000..39acf48
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/startwith02.adm
@@ -0,0 +1,14 @@
+true
+false
+true
+false
+false
+true
+true
+false
+true
+false
+true
+true
+false
+false
diff --git a/asterix-app/src/test/resources/runtimets/results/string/startwith03.adm b/asterix-app/src/test/resources/runtimets/results/string/startwith03.adm
new file mode 100644
index 0000000..ccb9311
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/startwith03.adm
@@ -0,0 +1,5 @@
+{ "name": "John Doe" }
+{ "name": "John Smith" }
+{ "name": "John Wayne" }
+{ "name": "Johnny Walker" }
+{ "name": "Johnson Ben" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strconcat01.adm b/asterix-app/src/test/resources/runtimets/results/string/strconcat01.adm
new file mode 100644
index 0000000..b597701
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strconcat01.adm
@@ -0,0 +1,9 @@
+{ "Full Name": "Young SeokKim" }
+{ "Full Name": "AlexBehm" }
+{ "Full Name": "JohnSmith" }
+{ "Full Name": "BobJones" }
+{ "Full Name": "MikeCarey" }
+{ "Full Name": "ChenLi" }
+{ "Full Name": "RamanGrover" }
+{ "Full Name": "YingyiBu" }
+{ "Full Name": "VinayakBorkar" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strconcat02.adm b/asterix-app/src/test/resources/runtimets/results/string/strconcat02.adm
new file mode 100644
index 0000000..38f2315
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strconcat02.adm
@@ -0,0 +1,3 @@
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+" ab  cdefgpoqrst "
+"This is a testand all tests must passand life is good..."
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strlen02.adm b/asterix-app/src/test/resources/runtimets/results/string/strlen02.adm
new file mode 100644
index 0000000..46e26f6
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strlen02.adm
@@ -0,0 +1,6 @@
+21
+21
+21
+25
+29
+28
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strlen03.adm b/asterix-app/src/test/resources/runtimets/results/string/strlen03.adm
new file mode 100644
index 0000000..368bdb9
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strlen03.adm
@@ -0,0 +1,12 @@
+13
+17
+5
+8
+5
+4
+14
+10
+7
+6
+5
+15
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strtocpt01.adm b/asterix-app/src/test/resources/runtimets/results/string/strtocpt01.adm
new file mode 100644
index 0000000..3308db7
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strtocpt01.adm
@@ -0,0 +1 @@
+[ 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48 ]
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strtocpt02.adm b/asterix-app/src/test/resources/runtimets/results/string/strtocpt02.adm
new file mode 100644
index 0000000..30602ee
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strtocpt02.adm
@@ -0,0 +1 @@
+[ 34, 39, 45, 61, 95, 43, 124, 92, 44, 46, 47, 60, 62, 63, 58, 59, 126, 96 ]
diff --git a/asterix-app/src/test/resources/runtimets/results/string/strtocpt03.adm b/asterix-app/src/test/resources/runtimets/results/string/strtocpt03.adm
new file mode 100644
index 0000000..9f30023
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/strtocpt03.adm
@@ -0,0 +1 @@
+[ 33, 64, 35, 36, 37, 94, 38, 42, 40, 41 ]
diff --git a/asterix-app/src/test/resources/runtimets/results/string/substr01.adm b/asterix-app/src/test/resources/runtimets/results/string/substr01.adm
new file mode 100644
index 0000000..ac9dedd
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/substr01.adm
@@ -0,0 +1 @@
+{ "str2": "ld", "str4": "g", "str6": "", "str8": "This is a test string", "str10": "This is a test string", "str13": "gThis is a another test string", "str14": "Irvine" }
diff --git a/asterix-app/src/test/resources/runtimets/results/string/substr04.adm b/asterix-app/src/test/resources/runtimets/results/string/substr04.adm
new file mode 100644
index 0000000..fcd3396
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/substr04.adm
@@ -0,0 +1,10 @@
+"world"
+"hello world"
+"llo world"
+"CD"
+"ABCD"
+"Irvine"
+"UC Irvine"
+"UC Irvine"
+"Irvine"
+"Irvine"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/substr05.adm b/asterix-app/src/test/resources/runtimets/results/string/substr05.adm
new file mode 100644
index 0000000..52a2718
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/substr05.adm
@@ -0,0 +1,8 @@
+"Berkeley"
+"Irvine"
+"LA"
+"Riverside"
+"San Diego"
+"Santa Barbara"
+"Austin "
+"Dallas"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/substr06.adm b/asterix-app/src/test/resources/runtimets/results/string/substr06.adm
new file mode 100644
index 0000000..52a2718
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/substr06.adm
@@ -0,0 +1,8 @@
+"Berkeley"
+"Irvine"
+"LA"
+"Riverside"
+"San Diego"
+"Santa Barbara"
+"Austin "
+"Dallas"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/toLowerCase02.adm b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase02.adm
new file mode 100644
index 0000000..65dfed7
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase02.adm
@@ -0,0 +1,12 @@
+"a   b  c  d  e  f  g"
+"a b c d e f g h i j k l m n o p q r s t u v w x y z"
+"abcdefghij klmnop qrstu vwxyz"
+"abcdefghijklmnopqrstuvwxyz"
+"this is a test string"
+"smaller string"
+"abcd"
+"abcdefghijklmnopqrstuvwxyz"
+"abcdefghijkabcdefghijk"
+"hijklmnopqrhijklmnopqr"
+"abcdefghijklmnopqrstuvwxyz01234"
+"a33b2cd1ef78ghijk123lmnopqrstuvw3x2y01035z"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/toLowerCase03.adm b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase03.adm
new file mode 100644
index 0000000..b6d7e8a
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase03.adm
@@ -0,0 +1,12 @@
+"beckham david"
+"cristiano ronaldo"
+"henry"
+"maradona"
+"messi"
+"pele"
+"roberto baggio"
+"ronaldinho"
+"ronaldo"
+"rooney"
+"tevez"
+"zinadine zidane"
diff --git a/asterix-app/src/test/resources/runtimets/results/string/toLowerCase04.adm b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase04.adm
new file mode 100644
index 0000000..2b33ad2
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/string/toLowerCase04.adm
@@ -0,0 +1,2 @@
+"abcdefghijklmnopqrstuvwxyz"
+"abcdefghijklmnopqrstuvwxyz"