MatchResult (Java Platform SE 7 ) (original) (raw)
- All Known Implementing Classes:
Matcher
public interface MatchResult
The result of a match operation.
This interface contains query methods used to determine the results of a match against a regular expression. The match boundaries, groups and group boundaries can be seen but not modified through a MatchResult.
Since:
1.5
See Also:
Matcher
Method Summary
Methods
Modifier and Type Method and Description int end() Returns the offset after the last character matched. int end(int group) Returns the offset after the last character of the subsequence captured by the given group during this match. String group() Returns the input subsequence matched by the previous match. String group(int group) Returns the input subsequence captured by the given group during the previous match operation. int groupCount() Returns the number of capturing groups in this match result's pattern. int start() Returns the start index of the match. int start(int group) Returns the start index of the subsequence captured by the given group during this match. Method Detail
* #### start int start() Returns the start index of the match. Returns: The index of the first character matched Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed * #### start int start(int group) Returns the start index of the subsequence captured by the given group during this match. [Capturing groups](Pattern.html#cg) are indexed from left to right, starting at one. Group zero denotes the entire pattern, so the expression _m._start(0) is equivalent to_m._start(). Parameters: `group` \- The index of a capturing group in this matcher's pattern Returns: The index of the first character captured by the group, or \-1 if the match was successful but the group itself did not match anything Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed `[IndexOutOfBoundsException](../../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If there is no capturing group in the pattern with the given index * #### end int end() Returns the offset after the last character matched. Returns: @return The offset after the last character matched Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed * #### end int end(int group) Returns the offset after the last character of the subsequence captured by the given group during this match. [Capturing groups](Pattern.html#cg) are indexed from left to right, starting at one. Group zero denotes the entire pattern, so the expression _m._end(0) is equivalent to_m._end(). Parameters: `group` \- The index of a capturing group in this matcher's pattern Returns: The offset after the last character captured by the group, or \-1 if the match was successful but the group itself did not match anything Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed `[IndexOutOfBoundsException](../../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If there is no capturing group in the pattern with the given index * #### group [String](../../../java/lang/String.html "class in java.lang") group() Returns the input subsequence matched by the previous match. For a matcher _m_ with input sequence _s_, the expressions _m._group() and_s._substring(_m._start(), _m._end()) are equivalent. Note that some patterns, for example a\*, match the empty string. This method will return the empty string when the pattern successfully matches the empty string in the input. Returns: The (possibly empty) subsequence matched by the previous match, in string form Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed * #### group [String](../../../java/lang/String.html "class in java.lang") group(int group) Returns the input subsequence captured by the given group during the previous match operation. For a matcher _m_, input sequence _s_, and group index_g_, the expressions _m._group(_g_) and_s._substring(_m._start(_g_), _m._end(_g_)) are equivalent. [Capturing groups](Pattern.html#cg) are indexed from left to right, starting at one. Group zero denotes the entire pattern, so the expression m.group(0) is equivalent to m.group(). If the match was successful but the group specified failed to match any part of the input sequence, then null is returned. Note that some groups, for example (a\*), match the empty string. This method will return the empty string when such a group successfully matches the empty string in the input. Parameters: `group` \- The index of a capturing group in this matcher's pattern Returns: The (possibly empty) subsequence captured by the group during the previous match, or null if the group failed to match part of the input Throws: `[IllegalStateException](../../../java/lang/IllegalStateException.html "class in java.lang")` \- If no match has yet been attempted, or if the previous match operation failed `[IndexOutOfBoundsException](../../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If there is no capturing group in the pattern with the given index * #### groupCount int groupCount() Returns the number of capturing groups in this match result's pattern. Group zero denotes the entire pattern by convention. It is not included in this count. Any non-negative integer smaller than or equal to the value returned by this method is guaranteed to be a valid group index for this matcher. Returns: The number of capturing groups in this matcher's pattern
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