Emphasize Unicode-aware features in Chapter 9

Author: marijnh

Diff for: 05_higher_order.md

@@ -202,6 +202,8 @@ There is a built-in array method, `forEach`, that provides something like a `for
 // → B
 ```
 
+{{id scripts}}
+
 ## Script data set
 
 One area where higher-order functions shine is data processing. To process data, we'll need some actual data. This chapter will use a ((data set)) about scripts—((writing system))s such as Latin, Cyrillic, or Arabic.

Diff for: 09_regexp.md

@@ -12,21 +12,21 @@ verify(/ferr(et|y|ari)/,
        ["ferret", "ferry", "ferrari"],
        ["ferrum", "transfer A"]);
 
-verify(/ious\b/,
+verify(/ious($|\P{L})/u,
        ["how delicious", "spacious room"],
        ["ruinous", "consciousness"]);
 
 verify(/\s[.,:;]/,
        ["bad punctuation ."],
        ["escape the dot"]);
 
-verify(/\w{7}/,
+verify(/\p{L}{7}/u,
        ["Siebentausenddreihundertzweiundzwanzig"],
        ["no", "three small words"]);
 
-verify(/\b[^\We]+\b/i,
+verify(/(^|\P{L})[^\P{L}e]+($|\P{L})/i,
        ["red platypus", "wobbling nest"],
-       ["earth bed", "learning ape", "BEET"]);
+       ["earth bed", "bedrøvet abe", "BEET"]);
 
 
 function verify(regexp, yes, no) {

Diff for: code/solutions/09_1_regexp_golf.js

@@ -1,5 +1,5 @@
 let text = "'I'm the cook,' he said, 'it's my job.'";
 
-console.log(text.replace(/(^|\W)'|'(\W|$)/g, '$1"$2'));
+console.log(text.replace(/(^|\P{L})'|'(\P{L}|$)/gu, '$1"$2'));
 // → "I'm the cook," he said, "it's my job."