[英]Removing escape characters
我嘗試了以下邏輯來轉義字符串中的特殊字符,並從轉義的字符串中刪除轉義字符。
public static void main(String a[])
{
String keyword = "otterbox 3500 series { { waterproof case \\(clear) phones";
System.out.println("INut keyword is "+keyword);
StringBuilder sb = new StringBuilder();
// * and ? is not included as they are wild card
for (int i = 0; i < keyword.length(); i++){
char c = keyword.charAt(i);
if (c == '\\' || c == '!' || c == '(' || c == ')' || c == '&' ||
c == ':' || c == '^' || c == '[' || c == ']' ||
c == '-' || c == '{' || c == '}' ||
c == '~'){
sb.append('\\');
}
sb.append(c);
}
keyword=sb.toString();
System.out.println("Escaped keyword is "+keyword);
if(keyword.contains("\\")){
int l=0;
int l2=0;
for (int i = 0; i < keyword.length(); i++){
char c = keyword.charAt(i);
if(c=='\\')l++;
if (c == '!' || c == '(' || c == ')' || c == '&' ||
c == ':' || c == '^' || c == '[' || c == ']' || c=='-'||
c == '{' || c == '}' || c == '~' || c=='(' || c== ')'){
keyword = keyword.replaceAll("\\\\\\"+c, ""+c);
l2++;
}
}
if(l==1) keyword= keyword.replaceAll("\\\\", "");
if(l>1 && l2==1) keyword = keyword.replaceFirst("\\\\", "");
}
System.out.println("Final "+keyword);
}
我希望最后一個關鍵字是otterbox 3500 series {{防水套\\(透明)手機,因為我想在字符串中使用\\。 但輸出將顯示為“ Final otterbox 3500 series {{防水套\\ \\(透明)手機”。 我在這里想念什么?
那么正則表達式呢?
String keyword = "e!s { { wat(erpr)o}o^f ca]se \\c(lear) pho][nes &: hee-l~o";
String escaped = keyword.replaceAll("([{}()\\[\\]\\\\!&:^~-])", "\\\\$1");
String unescaped = escaped.replaceAll("\\\\([{}()\\[\\]\\\\!&:^~-])", "$1");
System.out.println(keyword);
System.out.println(escaped);
System.out.println(unescaped);
印刷品:
e!s { { wat(erpr)o}o^f ca]se \c(lear) pho][nes &: hee-l~o
e\!s \{ \{ wat\(erpr\)o\}o\^f ca\]se \\c\(lear\) pho\]\[nes \&\: hee\-l\~o
e!s { { wat(erpr)o}o^f ca]se \c(lear) pho][nes &: hee-l~o
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