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From "Loic Guibert (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LANG-1139) Add replace by regular expression methods in StringUtils
Date Thu, 28 May 2015 12:18:17 GMT
Loic Guibert created LANG-1139:
----------------------------------

             Summary: Add replace by regular expression methods in StringUtils
                 Key: LANG-1139
                 URL: https://issues.apache.org/jira/browse/LANG-1139
             Project: Commons Lang
          Issue Type: New Feature
          Components: lang.*
            Reporter: Loic Guibert


Add null safe methods in {{StringUtils}} to replace by regular expression :
{code:java}
public static String replaceAll(final String text, final String regex, final String replacement);
public static String replaceFirst(final String text, final String regex, final String replacement);
{code}
Those methods are null safe equivalent to :
{code:java}
String.replaceAll(String, String);
String.replaceFirst(String, String);
{code}

The {{replacePattern(final String source, final String regex, final String replacement)}}
method adds {{Pattern#DOTALL}} option by default which may be undesired. Moreover, this methods
is not null safe.

More details :
{code:java}
/**
 * <p>Replaces each substring of the text String that matches the given regular expression
 * with the given replacement.</p>
 *
 * This method is a {@code null} safe equivalent to:
 * <ul>
 *  <li>{@code text.replaceAll(regex, replacement)}</li>
 *  <li>{@code Pattern.compile(regex).matcher(text).replaceAll(replacement)}</li>
 * </ul>
 *
 * <p>A {@code null} reference passed to this method is a no-op.</p>
 *
 * <p>Unlike in the {@link #replacePattern(String, String, String)} method, the {@link
Pattern#DOTALL} option
 * is NOT automatically added.
 * To use the DOTALL option prepend <code>"(?s)"</code> to the regex.
 * DOTALL is also know as single-line mode in Perl.</p>
 *
 * <pre>
 * StringUtils.replaceAll(null, *, *)      = null
 * StringUtils.replaceAll("any", null, *)  = "any"
 * StringUtils.replaceAll("any", *, null)  = "any"
 * StringUtils.replaceAll("", "", "zzz")   = "zzz"
 * StringUtils.replaceAll("", ".*", "zzz") = "zzz"
 * StringUtils.replaceAll("", ".+", "zzz") = ""
 * StringUtils.replaceAll("<__>\n<__>", "<.*>", "z") = "z\nz"
 * StringUtils.replaceAll("<__>\n<__>", "(?s)<.*>", "z") = "z"
 * StringUtils.replaceAll("ABCabc123", "[a-z]", "_")       = "ABC___123"
 * StringUtils.replaceAll("ABCabc123", "[^A-Z0-9]+", "_")  = "ABC_123"
 * StringUtils.replaceAll("ABCabc123", "[^A-Z0-9]+", "")   = "ABC123"
 * StringUtils.replaceAll("Lorem ipsum  dolor   sit", "( +)([a-z]+)", "_$2") = "Lorem_ipsum_dolor_sit"
 * </pre>
 *
 * @param text  text to search and replace in, may be null
 * @param regex  the regular expression to which this string is to be matched
 * @param replacement  the string to be substituted for each match
 * @return  the text with any replacements processed,
 *              {@code null} if null String input
 *
 * @throws  PatternSyntaxException
 *              if the regular expression's syntax is invalid
 *
 * @see String#replaceAll(String, String)
 * @see java.util.regex.Pattern
 * @see java.util.regex.Pattern#DOTALL
 */
public static String replaceAll(final String text, final String regex, final String replacement);

/**
 * <p>Replaces the first substring of the text string that matches the given regular
expression
 * with the given replacement.</p>
 *
 * This method is a {@code null} safe equivalent to:
 * <ul>
 *  <li>{@code text.replaceFirst(regex, replacement)}</li>
 *  <li>{@code Pattern.compile(regex).matcher(text).replaceFirst(replacement)}</li>
 * </ul>
 *
 * <p>A {@code null} reference passed to this method is a no-op.</p>
 *
 * <p>The {@link Pattern#DOTALL} option is NOT automatically added.
 * To use the DOTALL option prepend <code>"(?s)"</code> to the regex.
 * DOTALL is also know as single-line mode in Perl.</p>
 *
 * <pre>
 * StringUtils.replaceFirst(null, *, *)      = null
 * StringUtils.replaceFirst("any", null, *)  = "any"
 * StringUtils.replaceFirst("any", *, null)  = "any"
 * StringUtils.replaceFirst("", "", "zzz")   = "zzz"
 * StringUtils.replaceFirst("", ".*", "zzz") = "zzz"
 * StringUtils.replaceFirst("", ".+", "zzz") = ""
 * StringUtils.replaceFirst("<__>\n<__>", "<.*>", "z") = "z\n<__>"
 * StringUtils.replaceFirst("<__>\n<__>", "(?s)<.*>", "z") = "z"
 * StringUtils.replaceFirst("ABCabc123", "[a-z]", "_") = "ABC_bc123"
 * StringUtils.replaceFirst("ABCabc123abc", "[^A-Z0-9]+", "_") = "ABC_123abc"
 * StringUtils.replaceFirst("ABCabc123abc", "[^A-Z0-9]+", "") = "ABC123abc"
 * StringUtils.replaceFirst("Lorem ipsum  dolor   sit", "( +)([a-z]+)", "_$2") = "Lorem_ipsum
 dolor   sit"
 * </pre>
 *
 * @param text  text to search and replace in, may be null
 * @param regex  the regular expression to which this string is to be matched
 * @param replacement  the string to be substituted for the first match
 * @return  the text with the first replacement processed,
 *              {@code null} if null String input
 *
 * @throws  PatternSyntaxException
 *              if the regular expression's syntax is invalid
 *
 * @see String#replaceFirst(String, String)
 * @see java.util.regex.Pattern
 * @see java.util.regex.Pattern#DOTALL
 */
public static String replaceFirst(final String text, final String regex, final String replacement);
{code}



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