UnanchoredRegex (original) (raw)
Create a new Regex with the same pattern, but no requirement that the entire String matches in extractor patterns and Regex#matches.
Create a new Regex with the same pattern, but no requirement that the entire String matches in extractor patterns and Regex#matches.
Normally, matching on date behaves as though the pattern were enclosed in anchors, "^pattern$"`.`
The unanchored Regex behaves as though those anchors were removed.
Note that this method does not actually strip any matchers from the pattern.
Calling anchored returns the original Regex.
val date = """(\d\d\d\d)-(\d\d)-(\d\d)""".r.unanchored
val date(year, month, day) = "Date 2011-07-15" // OK
val copyright: String = "Date of this document: 2011-07-15" match {
case date(year, month, day) => s"Copyright $year" // OK
case _ => "No copyright"
}
Attributes
Returns
The new unanchored regex
Definition Classes
Source
Return all non-overlapping matches of this Regex in the given character sequence as a scala.util.matching.Regex.MatchIterator, which is a special scala.collection.Iterator that returns the matched strings but can also be queried for more data about the last match, such as capturing groups and start position.
Return all non-overlapping matches of this Regex in the given character sequence as a scala.util.matching.Regex.MatchIterator, which is a special scala.collection.Iterator that returns the matched strings but can also be queried for more data about the last match, such as capturing groups and start position.
A MatchIterator can also be converted into an iterator that returns objects of type scala.util.matching.Regex.Match, such as is normally returned by findAllMatchIn.
Where potential matches overlap, the first possible match is returned, followed by the next match that follows the input consumed by the first match:
val hat = "hat[^a]+".r
val hathaway = "hathatthattthatttt"
val hats = hat.findAllIn(hathaway).toList // List(hath, hattth)
val pos = hat.findAllMatchIn(hathaway).map(_.start).toList // List(0, 7)
To return overlapping matches, it is possible to formulate a regular expression with lookahead (?=) that does not consume the overlapping region.
val madhatter = "(h)(?=(at[^a]+))".r
val madhats = madhatter.findAllMatchIn(hathaway).map {
case madhatter(x,y) => s"$x$y"
}.toList // List(hath, hatth, hattth, hatttt)
Attempting to retrieve match information after exhausting the iterator results in java.lang.IllegalStateException. See scala.util.matching.Regex.MatchIterator for details.
Value parameters
source
The text to match against.
Attributes
Returns
A scala.util.matching.Regex.MatchIterator of matched substrings.
Example
for (words <- """\w+""".r findAllIn "A simple example.") yield words
Inherited from:
Source
Return an optional first matching string of this Regex in the given character sequence, or None if there is no match.
Return an optional first matching string of this Regex in the given character sequence, or None if there is no match.
Value parameters
source
The text to match against.
Attributes
Returns
An scala.Option of the first matching string in the text.
Example
"""\w+""".r findFirstIn "A simple example." foreach println // prints "A"
Inherited from:
Source
Return an optional first match of this Regex in the given character sequence, or None if it does not exist.
Return an optional first match of this Regex in the given character sequence, or None if it does not exist.
If the match is successful, the scala.util.matching.Regex.Match can be queried for more data.
Value parameters
source
The text to match against.
Attributes
Returns
A scala.Option of scala.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:
Source
Return an optional match of this Regex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Return an optional match of this Regex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Unlike findFirstMatchIn, this method will only return a match at the beginning of the input.
Value parameters
source
The text to match against.
Attributes
Returns
A scala.Option of the scala.util.matching.Regex.Match of the matched string.
Example
"""\w+""".r findPrefixMatchOf "A simple example." map (_.after) // returns Some(" simple example.")
Inherited from:
Source
Return an optional match of this Regex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Return an optional match of this Regex at the beginning of the given character sequence, or None if it matches no prefix of the character sequence.
Unlike findFirstIn, this method will only return a match at the beginning of the input.
Value parameters
source
The text to match against.
Attributes
Returns
A scala.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:
Source
Returns whether this Regex matches the given character sequence.
Returns whether this Regex 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 source matches this Regex.
See also
Example
"""\d+""".r matches "123" // returns true
Inherited from:
Source
Replaces all matches using a replacer function.
Replaces all matches using a replacer function. The replacer function takes a scala.util.matching.Regex.Match so that extra information can be obtained from the match. For example:
import scala.util.matching.Regex
val 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. Use Regex.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:
Source
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. Use Regex.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:
Source
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. Use Regex.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:
Source
Replaces some of the matches using a replacer function that returns an scala.Option.
Replaces some of the matches using a replacer function that returns an scala.Option. The replacer function takes a scala.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+)""".r
val 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. Use Regex.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:
Source
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:
Source
The string defining the regular expression
The string defining the regular expression
Attributes
Definition Classes
Inherited from:
Source
Tries to match on a scala.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:
Source
Tries to match the String representation of a scala.Char.
Tries to match the String representation of a scala.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 match
val r = """(\p{Lower})""".r
cat(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 extract
val r = """\p{Lower}""".r
cat(0) match { case r(x) => true } // no match
cat(0) match { case r(_) => true } // no match
cat(0) match { case r(_*) => true } // matches
cat(0) match { case r() => true } // matches
// even if there are multiple groups, only one is returned
val r = """((.))""".r
cat(0) match { case r(_) => true } // matches
cat(0) match { case r(_,_) => true } // no match
Value parameters
c
The Char to match
Attributes
Returns
The match
Inherited from:
Source
Tries to match a java.lang.CharSequence.
If the match succeeds, the result is a list of the matching groups (or a null 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 unanchored Regex.
For example:
val p1 = "ab*c".r
val p1Matches = "abbbc" match {
case p1() => true // no groups
case _ => false
}
val p2 = "a(b*)c".r
val 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.unanchored
val p3Matches = "abbbc" match {
case p3() => true // find the b's
case _ => false
}
val p4 = "a(b*)(c+)".r
val 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:
Source