Python的str.strip（）的Java等价物

Question

Suppose I would like to remove all " surrounding a string. In Python, I would:

>>> s='"Don\'t need the quotes"'
>>> print s
"Don't need the quotes"
>>> print s.strip('"')
Don't need the quotes

And if I want to remove multiple characters, eg " and parentheses:

>> s='"(Don\'t need quotes and parens)"'
>>> print s
"(Don't need quotes and parens)"
>>> print s.strip('"()')
Don't need quotes and parens

What's the elegant way to strip a string in Java?

Answer 1

Suppose I would like to remove all " surrounding a string

The closest equivalent to the Python code is:

s = s.replaceAll("^\"+", "").replaceAll("\"+$", "");

And if I want to remove multiple characters, eg " and parentheses:

s = s.replaceAll("^[\"()]+", "").replaceAll("[\"()]+$", "");

If you can use Apache Commons Lang , there's StringUtils.strip() .

Answer 2

The Guava library has a handy utility for it. The library contains CharMatcher.trimFrom() , which does what you want. You just need to create a CharMatcher which matches the characters you want to remove.

Code:

CharMatcher matcher = CharMatcher.is('"');
System.out.println(matcher.trimFrom(s));

CharMatcher matcher2 = CharMatcher.anyOf("\"()");
System.out.println(matcher2.trimFrom(s));

Internally, this does not create any new String, but just calls s.subSequence() . As it also doesn't need Regexps, I guess its the fastest solution (and surely the cleanest and easiest to understand).

Answer 3

In java, you can do it like :

s = s.replaceAll("\"",""),replaceAll("'","")

Also if you only want to replace "Start" and "End" quotes, you can do something like :

s = s.replace("^'", "").replace("'$", "").replace("^\"", "").replace("\"$", "");

OR if simply put :

s = s.replaceAll("^\"|\"$", "").replaceAll("^'|'$", "");

Answer 4

This replaces " and () at the beginning and end of a string

String str = "\"te\"st\"";
str = str.replaceAll("^[\"\\(]+|[\"\\)]+$", "");

Answer 5

try this:

new String newS = s.replaceAll("\"", "");

replace the double-quote with a no-character String.