ReplaceRegExp (Apache Ant API)
Keywords: org.apache.tools.ant.taskdefs.optional.ReplaceRegExp,ReplaceRegExp class

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## org.apache.tools.ant.taskdefs.optional
Class ReplaceRegExp

    java.lang.Object
      |
      +--org.apache.tools.ant.ProjectComponent
            |
            +--org.apache.tools.ant.Task
                  |
                  +--org.apache.tools.ant.taskdefs.optional.ReplaceRegExp

public class ReplaceRegExp
extends Task

Performs regular expression string replacements in a text file. The input file(s) must be able to be properly processed by a Reader instance. That is, they must be text only, no binary. The syntax of the regular expression depends on the implementation that you choose to use. The system property `ant.regexp.regexpimpl` will be the classname of the implementation that will be used (the default is `org.apache.tools.ant.util.regexp.JakartaOroRegexp` and requires the Jakarta Oro Package).

     For jdk  <= 1.3, there are two available implementations:
       org.apache.tools.ant.util.regexp.JakartaOroRegexp (the default)
            Requires  the jakarta-oro package

       org.apache.tools.ant.util.regexp.JakartaRegexpRegexp
            Requires the jakarta-regexp package

     For jdk >= 1.4 an additional implementation is available:
       org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp
            Requires the jdk 1.4 built in regular expression package.

     Usage:

       Call Syntax:

         <replaceregexp file="file"
                        match="pattern"
                        replace="pattern"
                        flags="options"?
                        byline="true|false"? >
           regexp?
           substitution?
           fileset*
         </replaceregexp>

        NOTE: You must have either the file attribute specified, or at least one fileset subelement
        to operation on.  You may not have the file attribute specified if you nest fileset elements
        inside this task.  Also, you cannot specify both match and a regular expression subelement at
        the same time, nor can you specify the replace attribute and the substitution subelement at
        the same time.

       Attributes:

         file    --> A single file to operation on (mutually exclusive
                        with the fileset subelements)
         match   --> The Regular expression to match
         replace --> The Expression replacement string
         flags   --> The options to give to the replacement
                     g = Substitute all occurrences. default is to replace only the first one
                     i = Case insensitive match

         byline  --> Should this file be processed a single line at a time (default is false)
                     "true" indicates to perform replacement on a line by line basis
                     "false" indicates to perform replacement on the whole file at once.

      Example:

         The following call could be used to replace an old property name in a ".properties"
         file with a new name.  In the replace attribute, you can refer to any part of the
         match expression in parenthesis using backslash followed by a number like '\1'.

         <replaceregexp file="test.properties"
                        match="MyProperty=(.*)"
                        replace="NewProperty=\1"
                        byline="true" />

Field Summary

Fields inherited from class org.apache.tools.ant.Task
`description, location, target, taskName, taskType, wrapper`

Fields inherited from class org.apache.tools.ant.ProjectComponent
`project`

Constructor Summary
`ReplaceRegExp()` Default Constructor

Method Summary
`void` | `addFileset(FileSet set)` list files to apply the replacement to
`RegularExpression` | `createRegexp()` A regular expression.
`Substitution` | `createSubstitution()` A substitution pattern.
`protected void` | `doReplace(java.io.File f, int options)` Perform the replacement on a file
`protected java.lang.String` | `doReplace(RegularExpression r, Substitution s, java.lang.String input, int options)` Invoke a regular expression (r) on a string (input) using substitutions (s) for a matching regex.
`void` | `execute()` Execute the task
`void` | `setByLine(boolean byline)` Process the file(s) one line at a time, executing the replacement on one line at a time.
`void` | `setByLine(java.lang.String byline)` Deprecated. - use setByLine(boolean)
`void` | `setEncoding(java.lang.String encoding)` Specifies the encoding Ant expects the files to be in - defaults to the platforms default encoding.
`void` | `setFile(java.io.File file)` file for which the regular expression should be replaced; required unless a nested fileset is supplied.
`void` | `setFlags(java.lang.String flags)` The flags to use when matching the regular expression.
`void` | `setMatch(java.lang.String match)` the regular expression pattern to match in the file(s); required if no nested <regexp> is used
`void` | `setReplace(java.lang.String replace)` The substitution pattern to place in the file(s) in place of the regular expression.

Methods inherited from class org.apache.tools.ant.Task
`getDescription, getLocation, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, maybeConfigure, perform, reconfigure, setDescription, setLocation, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType`

Methods inherited from class org.apache.tools.ant.ProjectComponent
`getProject, setProject`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ReplaceRegExp

    public ReplaceRegExp()

  Default Constructor

Method Detail

### setFile

    public void setFile(java.io.File file)

  file for which the regular expression should be replaced; required unless a nested fileset is supplied.

  Parameters:
    `file` - The file for which the reg exp should be replaced.

### setMatch

    public void setMatch(java.lang.String match)

  the regular expression pattern to match in the file(s); required if no nested <regexp> is used

  Parameters:
    `match` - the match attribute.

### setReplace

    public void setReplace(java.lang.String replace)

  The substitution pattern to place in the file(s) in place of the regular expression. Required if no nested <substitution> is used

  Parameters:
    `replace` - the replace attribute

### setFlags

    public void setFlags(java.lang.String flags)

  The flags to use when matching the regular expression. For more information, consult the Perl5 syntax.
  - g : Global replacement. Replace all occurrences found
  - i : Case Insensitive. Do not consider case in the match
  - m : Multiline. Treat the string as multiple lines of input, using "^" and "$" as the start or end of any line, respectively, rather than start or end of string.
  - s : Singleline. Treat the string as a single line of input, using "." to match any character, including a newline, which normally, it would not match.

  Parameters:
    `flags` - the flags attribute

### setByLine

    public void setByLine(java.lang.String byline)

  Deprecated. - use setByLine(boolean)

  Process the file(s) one line at a time, executing the replacement on one line at a time. This is useful if you want to only replace the first occurrence of a regular expression on each line, which is not easy to do when processing the file as a whole. Defaults to false.

  Parameters:
    `byline` - the byline attribute as a string

### setByLine

    public void setByLine(boolean byline)

  Process the file(s) one line at a time, executing the replacement on one line at a time. This is useful if you want to only replace the first occurrence of a regular expression on each line, which is not easy to do when processing the file as a whole. Defaults to false.

  Parameters:
    `byline` - the byline attribute

### setEncoding

    public void setEncoding(java.lang.String encoding)

  Specifies the encoding Ant expects the files to be in - defaults to the platforms default encoding.

  Parameters:
    `encoding` - the encoding attribute
  Since:
    Ant 1.6

### addFileset

    public void addFileset(FileSet set)

  list files to apply the replacement to

  Parameters:
    `set` - the fileset element

### createRegexp

    public RegularExpression createRegexp()

  A regular expression. You can use this element to refer to a previously defined regular expression datatype instance

  Returns:
    the regular expression object to be configured as an element

### createSubstitution

    public Substitution createSubstitution()

  A substitution pattern. You can use this element to refer to a previously defined substitution pattern datatype instance.

  Returns:
    the substitution pattern object to be configured as an element

### doReplace

    protected java.lang.String doReplace(RegularExpression r,
                                         Substitution s,
                                         java.lang.String input,
                                         int options)

  Invoke a regular expression (r) on a string (input) using substitutions (s) for a matching regex.

  Parameters:
    `r` - a regular expression
    `s` - a Substitution
    `input` - the string to do the replacement on
    `options` - The options for the regular expression
  Returns:
    the replacement result

### doReplace

    protected void doReplace(java.io.File f,
                             int options)
                      throws java.io.IOException

  Perform the replacement on a file

  Parameters:
    `f` - the file to perform the relacement on
    `options` - the regular expressions options
  Throws:
    `java.io.IOException` - if an error occurs

### execute

    public void execute()
                 throws BuildException

  Execute the task

  Overrides:
    `execute` in class `Task`
  Throws:
    `BuildException` - is there is a problem in the task execution.

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