September 2017 Update

Task/Substring/Jq/substring-1.jq

@@ -0,0 +1 @@
+def s: "一二三四五六七八九十";

Task/Substring/Jq/substring-2.jq

@@ -0,0 +1 @@
+def ix(s): explode | index(s|explode);

Task/Substring/Jq/substring-3.jq

@@ -0,0 +1,20 @@
+# starting from n characters in and of m length:  .[n+1: n+m+1]
+"s[1:2] => \( s[1:2] )",
+
+# starting from n characters in, up to the end of the string:  .[n+1:]
+"s[9:] => \( s[9:] )",
+
+# whole string minus last character: .[0:length-1]
+"s|.[0:length-1] => \(s | .[0:length-1] )",
+
+# starting from a known character within the string and of m length:
+  # jq 1.4: ix(c) as $i | .[ $i: $i + m]
+  # jq>1.4: match(c).offset as $i | .[ $i: $i + m]
+"s | ix(\"五\") as $i | .[$i: $i + 1] => \(s | ix("五") as $i | .[$i: $i + 1] )",
+
+
+# starting from a known substring within the string and of m length:
+  # jq 1.4: ix(sub) as $i | .[ $i: $i + m]
+  # jq>1.4: match(sub).offset as $i | .[ $i: $i + m]
+"s | ix(\"五六\") as $i | .[$i: $i + 2] => " +
+ "\( s | ix("五六") as $i | .[$i: $i + 2] )"

Task/Substring/Jq/substring-4.jq

@@ -0,0 +1,6 @@
+$ jq -M -n -r -f Substring.jq
+s[1:2] => 二
+s[9:] => 十
+s|.[0:length-1] => 一二三四五六七八九
+s | ix("五") as $i | .[$i: $i + 1] => 五
+s | ix("五六") as $i | .[$i: $i + 2] => 五六