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CHAPTER 10 USING THE F# AND .NET LIBRARIES
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> let m = (regex @"joe").Match("maryjoewashere");; val m : Match > if m.Success then printfn "Matched at position %d" m.Index;; Matched at position 4 val it : unit = () Replacing text is also easy: > let text = "was a dark and stormy night";; val text: string > let t2 = (regex @"\w+").Replace(text, "WORD");; val t2: string = "WORD WORD WORD WORD WORD WORD" Here, you use the regular expression "\w+" for a sequence of word characters. Table 10-6 shows the broad range of specifiers you can use with .NET regular expressions. Table 10-6. Regular Expression Escape Characters
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Ordinary characters .
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Characters other than . $ ^ { [ ( | ) * + \ match themselves. Matches any character except \n. If RegexOptions.SingleLine is specified, then it matches every character. Matches any of the given characters or character ranges. Matches any character other than the given characters or character ranges. Matches any character in the named character class specified by {name}. See the .NET documentation for full details. Matches text not included in groups and block ranges specified in {name}. Matches any word character. Matches any nonword character. Matches any whitespace character. Matches any nonwhitespace character.
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[aeiou0-9] [^aeiou0-9]
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\p{name}
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\P{name} \w \W \s \S
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CHAPTER 10 USING THE F# AND .NET LIBRARIES
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Characters
\d \D \a \b
Description
Matches any decimal digit. Matches any nondigit. Matches a bell (alarm) \u0007. Matches a backspace \u0008 if in a [] character class; otherwise, in a regular expression, \b denotes a word boundary (between \w and \W characters). In a replacement pattern, \b always denotes a backspace. Matches a tab \u0009. Matches a carriage return \u000D. Matches a vertical tab \u000B. Matches a form feed \u000C. Matches a new line \u000A. Matches an escape \u001B. Matches a back reference. Matches an ASCII character as octal. Matches an ASCII character using hexadecimal representation (exactly two digits). Matches an ASCII control character; for example, \cC is Ctrl+C. Matches a Unicode character using hexadecimal representation (exactly four digits). When followed by a character that isn t recognized as an escaped character, matches that character. For example, \* is the same as \x2A.
\t \r \v \f \n \e \digit \040 \x20
\cC \u0020
You can specify case-insensitive matches by using ( i) at the start of a regular expression: > samplestring =~ regex "( i)HIS";; val it : bool = true > samplestring =~ regex "HIS";; val it : bool = false
CHAPTER 10 USING THE F# AND .NET LIBRARIES
Here is a final example, showing the use of named groups: let entry = @" Jolly Jethro 13 Kings Parade Cambridge, Cambs CB2 1TJ " let re = regex @"( <=\n)\s*( <city>[^\n]+)\s*,\s*( <county>\w+)\s+( <pcode>.{3}\s*.{3}).*$" You can now use this regular expression to match the text and examine the named elements of the match: > let r = re.Match(entry);; val r : Match > r.Groups.["city"].Value;; val it : string = "Cambridge" > r.Groups.["county"].Value;; val it : string = "Cambs" > r.Groups.["pcode"].Value;; val it : string = "CB2 1TJ" You can also combine regular expression matching with active patterns, described in 9. For example: let (|IsMatch|_|) (re: string) (inp:string) = if Regex(re).IsMatch(inp) then Some() else None let (|MatchGroups|_|) (re: string) (inp:string) = let results = Regex(re).Match(inp) if results.Success then Some results.Groups else None These active patterns can now be used as follows: > | | | match "This is a string" with IsMatch "( i)HIS" -> "yes, it matched" IsMatch "ABC" -> "this would not match" _ -> "nothing matched"
val it : string = "yes, it matched " > match "This is a super string" with | MatchGroups "( <word1>T\w+).*( <word2>s\w+)" groups -> (groups.["word1"].Value, groups.["word2"].Value) | _ -> failwith "nothing matched" val it : string * string = ("This", "string")
CHAPTER 10 USING THE F# AND .NET LIBRARIES
Finally, you can use the dynamic operator, also defined in 9, to make the lookups slightly more natural: > match "This is a string is super" with | MatchGroups "( <word1>T\w+).*( <word2>s\w+)" groups -> (groups word1, groups word2) | _ -> failwith "nothing matched" val it : string * string = ("This", "super")
Note .NET regular expressions have many more features than those described here. For example, you can
compile regular expressions to make them match very efficiently. You can also use regular expressions to define sophisticated text substitutions.
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