UnanchoredRegex
ARegex that finds the first match when used in a pattern match.
Attributes
- See also
- Source
- Regex.scala
- Graph
- Supertypes
Members list
Value members
Concrete methods
Attributes
- Definition Classes
- Source
- Regex.scala
Create a new Regex with the same pattern, but no requirement that the entire String matches in extractor patterns andRegex#matches.
Create a new Regex with the same pattern, but no requirement that the entire String matches in extractor patterns andRegex#matches.
Normally, matching ondate behaves as though the pattern were enclosed in anchors,"^pattern$".
The unanchoredRegex behaves as though those anchors were removed.
Note that this method does not actually strip any matchers from the pattern.
Callinganchored returns the originalRegex.
val date = """(\d\d\d\d)-(\d\d)-(\d\d)""".r.unanchoredval date(year, month, day) = "Date 2011-07-15" // OKval copyright: String = "Date of this document: 2011-07-15" match { case date(year, month, day) => s"Copyright $year" // OK case _ => "No copyright"}Attributes
- Returns
The new unanchored regex
- Definition Classes
- Source
- Regex.scala
Inherited methods
Attributes
- Inherited from:
- Regex
- Source
- Regex.scala
Return all non-overlapping matches of thisRegex in the given character sequence as ascala.util.matching.Regex.MatchIterator, which is a specialscala.collection.Iterator that returns the matched strings but can also be queried for more data about the last match, such as capturing groups and start position.
Return all non-overlapping matches of thisRegex in the given character sequence as ascala.util.matching.Regex.MatchIterator, which is a specialscala.collection.Iterator that returns the matched strings but can also be queried for more data about the last match, such as capturing groups and start position.
AMatchIterator can also be converted into an iterator that returns objects of typescala.util.matching.Regex.Match, such as is normally returned byfindAllMatchIn.
Where potential matches overlap, the first possible match is returned, followed by the next match that follows the input consumed by the first match:
val hat = "hat[^a]+".rval hathaway = "hathatthattthatttt"val hats = hat.findAllIn(hathaway).toList // List(hath, hattth)val pos = hat.findAllMatchIn(hathaway).map(_.start).toList // List(0, 7)To return overlapping matches, it is possible to formulate a regular expression with lookahead (?=) that does not consume the overlapping region.
val madhatter = "(h)(?=(at[^a]+))".rval madhats = madhatter.findAllMatchIn(hathaway).map { case madhatter(x,y) => s"$x$y"}.toList // List(hath, hatth, hattth, hatttt)Attempting to retrieve match information after exhausting the iterator results injava.lang.IllegalStateException. Seescala.util.matching.Regex.MatchIterator for details.
Value parameters
- source
The text to match against.
Attributes
- Returns
Ascala.util.matching.Regex.MatchIterator of matched substrings.
- Example
for (words <- """\w+""".r findAllIn "A simple example.") yield words- Inherited from:
- Regex
- Source
- Regex.scala
Return all non-overlapping matches of this regexp in given character sequence as ascala.collection.Iterator ofscala.util.matching.Regex.Match.
Return all non-overlapping matches of this regexp in given character sequence as ascala.collection.Iterator ofscala.util.matching.Regex.Match.
Value parameters
- source
The text to match against.
Attributes
- Returns
Ascala.collection.Iterator ofscala.util.matching.Regex.Match for all matches.
- Example
for (words <- """\w+""".r findAllMatchIn "A simple example.") yield words.start- Inherited from:
- Regex
- Source
- Regex.scala
Return an optional first matching string of thisRegex in the given character sequence, or None if there is no match.
Return an optional first matching string of thisRegex in the given character sequence, or None if there is no match.
Value parameters
- source
The text to match against.
Attributes
- Returns
Anscala.Option of the first matching string in the text.
- Example
"""\w+""".r findFirstIn "A simple example." foreach println // prints "A"- Inherited from:
- Regex
- Source
- Regex.scala
Return an optional first match of thisRegex in the given character sequence, or None if it does not exist.
Return an optional first match of thisRegex in the given character sequence, or None if it does not exist.
If the match is successful, thescala.util.matching.Regex.Match can be queried for more data.
Value parameters
- source
The text to match against.
Attributes
- Returns
Ascala.Option ofscala.util.matching.Regex.Match of the first matching string in the text.
- Example
("""[a-z]""".r findFirstMatchIn "A simple example.") map (_.start) // returns Some(2), the index of the first match in the text- Inherited from:
- Regex
- Source
- Regex.scala
Return an optional match of thisRegex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Return an optional match of thisRegex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
UnlikefindFirstMatchIn, this method will only return a match at the beginning of the input.
Value parameters
- source
The text to match against.
Attributes
- Returns
Ascala.Option of thescala.util.matching.Regex.Match of the matched string.
- Example
"""\w+""".r findPrefixMatchOf "A simple example." map (_.after) // returns Some(" simple example.")- Inherited from:
- Regex
- Source
- Regex.scala
Return an optional match of thisRegex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Return an optional match of thisRegex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
UnlikefindFirstIn, this method will only return a match at the beginning of the input.
Value parameters
- source
The text to match against.
Attributes
- Returns
Ascala.Option of the matched prefix.
- Example
"""\p{Lower}""".r findPrefixOf "A simple example." // returns None, since the text does not begin with a lowercase letter- Inherited from:
- Regex
- Source
- Regex.scala
Returns whether thisRegex matches the given character sequence.
Returns whether thisRegex matches the given character sequence.
Like the extractor, this method takes anchoring into account.
Value parameters
- source
The text to match against
Attributes
- Returns
true if and only if
sourcematches thisRegex.- See also
- Example
"""\d+""".r matches "123" // returns true- Inherited from:
- Regex
- Source
- Regex.scala
Attributes
- Inherited from:
- Regex
- Source
- Regex.scala
Replaces all matches using a replacer function.
Replaces all matches using a replacer function. The replacer function takes ascala.util.matching.Regex.Match so that extra information can be obtained from the match. For example:
import scala.util.matching.Regexval datePattern = new Regex("""(\d\d\d\d)-(\d\d)-(\d\d)""", "year", "month", "day")val text = "From 2011-07-15 to 2011-07-17"val repl = datePattern replaceAllIn (text, m => s"${m group "month"}/${m group "day"}")In the replacement String, a dollar sign ($) followed by a number will be interpreted as a reference to a group in the matched pattern, with numbers 1 through 9 corresponding to the first nine groups, and 0 standing for the whole match. Any other character is an error. The backslash (\) character will be interpreted as an escape character and can be used to escape the dollar sign. UseRegex.quoteReplacement to escape these characters.
Value parameters
- replacer
The function which maps a match to another string.
- target
The string to match.
Attributes
- Returns
The target string after replacements.
- Inherited from:
- Regex
- Source
- Regex.scala
Replaces all matches by a string.
Replaces all matches by a string.
In the replacement String, a dollar sign ($) followed by a number will be interpreted as a reference to a group in the matched pattern, with numbers 1 through 9 corresponding to the first nine groups, and 0 standing for the whole match. Any other character is an error. The backslash (\) character will be interpreted as an escape character and can be used to escape the dollar sign. UseRegex.quoteReplacement to escape these characters.
Value parameters
- replacement
The string that will replace each match
- target
The string to match
Attributes
- Returns
The resulting string
- Example
"""\d+""".r replaceAllIn ("July 15", "<NUMBER>") // returns "July <NUMBER>"- Inherited from:
- Regex
- Source
- Regex.scala
Replaces the first match by a string.
Replaces the first match by a string.
In the replacement String, a dollar sign ($) followed by a number will be interpreted as a reference to a group in the matched pattern, with numbers 1 through 9 corresponding to the first nine groups, and 0 standing for the whole match. Any other character is an error. The backslash (\) character will be interpreted as an escape character and can be used to escape the dollar sign. UseRegex.quoteReplacement to escape these characters.
Value parameters
- replacement
The string that will replace the match
- target
The string to match
Attributes
- Returns
The resulting string
- Inherited from:
- Regex
- Source
- Regex.scala
Replaces some of the matches using a replacer function that returns anscala.Option.
Replaces some of the matches using a replacer function that returns anscala.Option. The replacer function takes ascala.util.matching.Regex.Match so that extra information can be obtained from the match. For example:
import scala.util.matching.Regex._val vars = Map("x" -> "a var", "y" -> """some $ and \ signs""")val text = "A text with variables %x, %y and %z."val varPattern = """%(\w+)""".rval mapper = (m: Match) => vars get (m group 1) map (quoteReplacement(_))val repl = varPattern replaceSomeIn (text, mapper)In the replacement String, a dollar sign ($) followed by a number will be interpreted as a reference to a group in the matched pattern, with numbers 1 through 9 corresponding to the first nine groups, and 0 standing for the whole match. Any other character is an error. The backslash (\) character will be interpreted as an escape character and can be used to escape the dollar sign. UseRegex.quoteReplacement to escape these characters.
Value parameters
- replacer
The function which optionally maps a match to another string.
- target
The string to match.
Attributes
- Returns
The target string after replacements.
- Inherited from:
- Regex
- Source
- Regex.scala
Splits the provided character sequence around matches of this regexp.
Splits the provided character sequence around matches of this regexp.
Value parameters
- toSplit
The character sequence to split
Attributes
- Returns
The array of strings computed by splitting the input around matches of this regexp
- Inherited from:
- Regex
- Source
- Regex.scala
The string defining the regular expression
The string defining the regular expression
Attributes
- Definition Classes
- Inherited from:
- Regex
- Source
- Regex.scala
Tries to match on ascala.util.matching.Regex.Match.
Tries to match on ascala.util.matching.Regex.Match.
A previously failed match results in None.
If a successful match was made against the current pattern, then that result is used.
Otherwise, this Regex is applied to the previously matched input, and the result of that match is used.
Attributes
- Inherited from:
- Regex
- Source
- Regex.scala
Tries to match the String representation of ascala.Char.
Tries to match the String representation of ascala.Char.
If the match succeeds, the result is the first matching group if any groups are defined, or an empty Sequence otherwise.
For example:
val cat = "cat"// the case must consume the group to matchval r = """(\p{Lower})""".rcat(0) match { case r(x) => true }cat(0) match { case r(_) => true }cat(0) match { case r(_*) => true }cat(0) match { case r() => true } // no match// there is no group to extractval r = """\p{Lower}""".rcat(0) match { case r(x) => true } // no matchcat(0) match { case r(_) => true } // no matchcat(0) match { case r(_*) => true } // matchescat(0) match { case r() => true } // matches// even if there are multiple groups, only one is returnedval r = """((.))""".rcat(0) match { case r(_) => true } // matchescat(0) match { case r(_,_) => true } // no matchValue parameters
- c
The Char to match
Attributes
- Returns
The match
- Inherited from:
- Regex
- Source
- Regex.scala
Tries to match ajava.lang.CharSequence.
Tries to match ajava.lang.CharSequence.
If the match succeeds, the result is a list of the matching groups (or anull element if a group did not match any input). If the pattern specifies no groups, then the result will be an empty list on a successful match.
This method attempts to match the entire input by default; to find the next matching subsequence, use an unanchoredRegex.
For example:
val p1 = "ab*c".rval p1Matches = "abbbc" match { case p1() => true // no groups case _ => false}val p2 = "a(b*)c".rval p2Matches = "abbbc" match { case p2(_*) => true // any groups case _ => false}val numberOfB = "abbbc" match { case p2(b) => Some(b.length) // one group case _ => None}val p3 = "b*".r.unanchoredval p3Matches = "abbbc" match { case p3() => true // find the b's case _ => false}val p4 = "a(b*)(c+)".rval p4Matches = "abbbcc" match { case p4(_*) => true // multiple groups case _ => false}val allGroups = "abbbcc" match { case p4(all @ _*) => all mkString "/" // "bbb/cc" case _ => ""}val cGroup = "abbbcc" match { case p4(_, c) => c case _ => ""}Value parameters
- s
The string to match
Attributes
- Returns
The matches
- Inherited from:
- Regex
- Source
- Regex.scala
Inherited fields
Attributes
- Inherited from:
- Regex
- Source
- Regex.scala