替换字符串中的多个子字符串

Question

该函数用于用相应的值替换字符串中的某些子字符串。

//地图（string_to_replace，string_to_replace_with）

String template = "ola ala kala pala sala"; 
StringBuilder populatedTemplate = new StringBuilder(); 
HashMap<String, String> map = new HashMap<>(); 
map.put("ola", "patola"); 
map.put("pala", "papala"); 

int i=0; 
for (String word : template.split("'")) { 
    populatedTemplate.append(map.getOrDefault(word, word)); 
    populatedTemplate.append(" "); 
} 

System.out.println(populatedTemplate.toString()); 

此上述功能工作正常，如果要被替换字符串为““（空格）所包围。

Ex- String =>“嘿{how} are $ = you” 如果要替换的子字符串是“嗨”或“你”，那么它工作正常。问题是我想要替换“如何”和“你”。

如何在不增加复杂度的情况下实现这一目标？

Answer 1

我要替换只是你在地图上，并保持休息，因为它是的话，你可以继续为下一个：

String template = "Hey {how} are $=you"; 
StringBuilder populatedTemplate = new StringBuilder(); 
Map<String, String> map = new HashMap<>(); 
map.put("how", "HH"); 
map.put("you", "YY"); 
// Pattern allowing to extract only the words 
Pattern pattern = Pattern.compile("\\w+"); 
Matcher matcher = pattern.matcher(template); 
int fromIndex = 0; 
while (matcher.find(fromIndex)) { 
    // The start index of the current word 
    int startIdx = matcher.start(); 
    if (fromIndex < startIdx) { 
     // Add what we have between two words 
     populatedTemplate.append(template, fromIndex, startIdx); 
    } 
    // The current word 
    String word = matcher.group(); 
    // Replace the word by itself or what we have in the map 
    populatedTemplate.append(map.getOrDefault(word, word)); 
    // Start the next find from the end index of the current word 
    fromIndex = matcher.end(); 
} 
if (fromIndex < template.length()) { 
    // Add the remaining sub String 
    populatedTemplate.append(template, fromIndex, template.length()); 
} 
System.out.println(populatedTemplate); 

输出：

Hey {HH} are $=YY 

回复更新：

假设您希望能够替换不仅单词而且ything像${questionNumber}，您将需要动态创建的正则表达式是这样的：

String template = "Hey {how} are $=you id=minScaleBox-${questionNumber}"; 
... 
map.put("${questionNumber}", "foo"); 
StringBuilder regex = new StringBuilder(); 
boolean first = true; 
for (String word : map.keySet()) { 
    if (first) { 
     first = false; 
    } else { 
     regex.append('|'); 
    } 
    regex.append(Pattern.quote(word)); 
} 
Pattern pattern = Pattern.compile(regex.toString()); 
... 

输出：

Hey {HH} are $=YY id=minScaleBox-foo