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# std/jsre

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Source Edit

Regular Expressions for the JavaScript target.

- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

Example:

    import std/jsre
    let jsregex: RegExp = newRegExp(r"\s+", r"i")
    jsregex.compile(r"\w+", r"i")
    assert "nim javascript".contains jsregex
    assert jsregex.exec(r"nim javascript") == @["nim".cstring]
    assert jsregex.toCstring() == r"/\w+/i"
    jsregex.compile(r"[0-9]", r"i")
    assert "0123456789abcd".contains jsregex
    assert $jsregex == "/[0-9]/i"
    jsregex.compile(r"abc", r"i")
    assert "abcd".startsWith jsregex
    assert "dabc".endsWith jsregex
    jsregex.compile(r"\d", r"i")
    assert "do1ne".split(jsregex) == @["do".cstring, "ne".cstring]
    jsregex.compile(r"[lw]", r"i")
    assert "hello world".replace(jsregex,"X") == "heXlo world"
    jsregex.compile(r"([a-z])\1*", r"g")
    assert "abbcccdddd".replace(jsregex, proc (m: varargs[cstring]): cstring = ($m[0] & $(m.len)).cstring) == "a1b2c3d4"
    let digitsRegex: RegExp = newRegExp(r"\d")
    assert "foo".match(digitsRegex) == @[]

# Types

    RegExp = ref object of JsRoot
      flags*: cstring            ## cstring that contains the flags of the RegExp object.
      dotAll*: bool              ## Whether `.` matches newlines or not.
      global*: bool              ## Whether to test against all possible matches in a string, or only against the first.
      ignoreCase*: bool          ## Whether to ignore case while attempting a match in a string.
      multiline*: bool           ## Whether to search in strings across multiple lines.
      source*: cstring           ## The text of the pattern.
      sticky*: bool              ## Whether the search is sticky.
      unicode*: bool             ## Whether Unicode features are enabled.
      lastIndex*: cint           ## Index at which to start the next match (read/write property).
      input*: cstring            ## Read-only and modified on successful match.
      lastMatch*: cstring        ## Ditto.
      lastParen*: cstring        ## Ditto.
      leftContext*: cstring      ## Ditto.
      rightContext*: cstring     ## Ditto.
      hasIndices*: bool          ## https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/hasIndices

  Regular Expressions for JavaScript target. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp Source Edit

# Procs

    func `$`(self: RegExp): string {....raises: [], tags: [], forbids: [].}

  Source Edit

    func compile(self: RegExp; pattern: cstring; flags: cstring) {.
        importjs: "#.compile(@)", ...raises: [], tags: [], forbids: [].}

  Recompiles a regular expression during execution of a script. Source Edit

    func contains(pattern: cstring; self: RegExp): bool {....raises: [], tags: [],
        forbids: [].}

  Tests for a substring match in its string parameter.

  Example:

      let jsregex: RegExp = newRegExp(r"bc$", r"i")
      assert jsregex in r"abc"
      assert jsregex notin r"abcd"
      assert "xabc".contains jsregex

  Source Edit

    func endsWith(pattern: cstring; self: RegExp): bool {....raises: [], tags: [],
        forbids: [].}

  Tests if string ends with given RegExp

  Example:

      let jsregex: RegExp = newRegExp(r"bcd", r"i")
      assert "abcd".endsWith jsregex

  Source Edit

    func exec(self: RegExp; pattern: cstring): seq[cstring] {.
        importjs: "(#.exec(#) || [])", ...raises: [], tags: [], forbids: [].}

  Executes a search for a match in its string parameter. Source Edit

    func match(pattern: cstring; self: RegExp): seq[cstring] {.
        importjs: "(#.match(#) || [])", ...raises: [], tags: [], forbids: [].}

  Returns an array of matches of a RegExp against given string Source Edit

    func newRegExp(pattern: cstring): RegExp {.importjs: "new RegExp(@)",
        ...raises: [], tags: [], forbids: [].}

  Source Edit

    func newRegExp(pattern: cstring; flags: cstring): RegExp {.
        importjs: "new RegExp(@)", ...raises: [], tags: [], forbids: [].}

  Creates a new RegExp object. Source Edit

    func replace(pattern: cstring; self: RegExp;
                 cb: proc (args: varargs[cstring]): cstring): cstring {.importcpp,
        ...raises: [], tags: [], forbids: [].}

  Returns a new string with some or all matches of a pattern replaced by given callback function Source Edit

    func replace(pattern: cstring; self: RegExp; replacement: cstring): cstring {.
        importjs: "#.replace(#, #)", ...raises: [], tags: [], forbids: [].}

  Returns a new string with some or all matches of a pattern replaced by given replacement Source Edit

    func split(pattern: cstring; self: RegExp): seq[cstring] {.
        importjs: "(#.split(#) || [])", ...raises: [], tags: [], forbids: [].}

  Divides a string into an ordered list of substrings and returns the array Source Edit

    func startsWith(pattern: cstring; self: RegExp): bool {....raises: [], tags: [],
        forbids: [].}

  Tests if string starts with given RegExp

  Example:

      let jsregex: RegExp = newRegExp(r"abc", r"i")
      assert "abcd".startsWith jsregex

  Source Edit

    func toCstring(self: RegExp): cstring {.importjs: "#.toString()", ...raises: [],
                                            tags: [], forbids: [].}

  Returns a string representing the RegExp object. Source Edit