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java-algorithm-2010/PuzzleCoding/src/RegexMatch.java at master · xiaoningning/java-algorithm-2010 · GitHub
xiaoningning
java-algorithm-2010
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java-algorithm-2010
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PuzzleCoding
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src
/
RegexMatch.java
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58 lines (52 loc) · 1.88 KB
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java-algorithm-2010
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PuzzleCoding
/
src
/
RegexMatch.java
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/**
* implement regular expression matching with support for '.' and '*'.
* '.' Matches any single character.
* '*' Matches zero or more of the preceding element.
* <p/>
* The matching should cover the entire input string (not partial).
* <p/>
* The function prototype should be:
* bool isMatch(const char *s, const char *p)
* <p/>
* Some examples:
* isMatch("aa","a") ? false
* isMatch("aa","aa") ? true
* isMatch("aaa","aa") ? false
* isMatch("aa", "a*") ? true
* isMatch("aa", ".*") ? true
* isMatch("ab", ".*") ? true
* isMatch("aab", "c*a*b") ? true
*/
public
class
RegexMatch
{
public
static
void
main
(
String
[]
args
) {
// boolean match = isMatch("aa","aa");
// boolean match = isMatch("aaa","aa");
// boolean match = isMatch("aa", "a*");
// boolean match = isMatch("aa", ".*");
boolean
match
=
isMatch
(
"ab"
,
".*"
);
// boolean match = isMatch("aab", "c*a*b");
System
.
out
.
println
(
match
);
}
public
static
boolean
isMatch
(
String
s
,
String
p
) {
if
(
s
==
null
||
p
==
null
)
return
false
;
if
(
p
.
isEmpty
())
return
s
.
isEmpty
();
if
(
p
.
length
() >=
2
) {
if
(
p
.
charAt
(
1
) ==
'*'
) {
if
(!
s
.
isEmpty
()) {
if
(
p
.
charAt
(
0
) ==
'.'
||
p
.
charAt
(
0
) ==
s
.
charAt
(
0
))
return
isMatch
(
s
.
substring
(
1
),
p
) ||
isMatch
(
s
,
p
.
substring
(
2
));
else
return
isMatch
(
s
,
p
.
substring
(
2
));
}
else
return
true
;
// s:"", p:"a*" || ".*"
}
}
// p is not empty, then at least 1
if
(
p
.
charAt
(
0
) ==
'.'
) {
if
(
s
.
isEmpty
())
return
false
;
// s:"", p:"."
else
return
isMatch
(
s
.
substring
(
1
),
p
.
substring
(
1
));
}
if
(
s
.
charAt
(
0
) !=
p
.
charAt
(
0
))
return
false
;
return
isMatch
(
s
.
substring
(
1
),
p
.
substring
(
1
));
}
}
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