Created
March 28, 2012 14:03
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Simplify the insanity of Regex in Java
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import com.googlecode.totallylazy.Callable1; | |
import com.googlecode.totallylazy.Option; | |
import java.util.regex.Matcher; | |
import java.util.regex.Pattern; | |
import static com.googlecode.totallylazy.Option.none; | |
import static com.googlecode.totallylazy.Option.some; | |
import static com.googlecode.totallylazy.numbers.Numbers.range; | |
public class Regex { | |
private final String pattern; | |
public Regex(String pattern) { | |
this.pattern = pattern; | |
} | |
public boolean matches(String source) { | |
return match(source).matches(); | |
} | |
public Option<String> findIn(String source) { | |
Matcher matcher = match(source); | |
if (matcher.find()) { | |
return some(matcher.group(0)); | |
} else { | |
return none(); | |
} | |
} | |
public Option<Iterable<String>> findGroupsIn(String source) { | |
Matcher matcher = match(source); | |
if (matcher.find()) { | |
Iterable<String> matches = range(1, matcher.groupCount() + 1).map(getGroupFrom(matcher)); | |
return some(matches); | |
} else { | |
return none(); | |
} | |
} | |
public Option<String> findFirstGroupIn(String source) { | |
Matcher matcher = match(source); | |
if (matcher.find() && matcher.groupCount() > 0) { | |
return some(matcher.group(1)); | |
} else { | |
return none(); | |
} | |
} | |
private Matcher match(String source) { | |
return Pattern.compile(pattern).matcher(source); | |
} | |
private Callable1<Number, String> getGroupFrom(final Matcher matcher) { | |
return new Callable1<Number, String>() { | |
public String call(Number number) { | |
return matcher.group(number.intValue()); | |
} | |
}; | |
} | |
} |
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