Hello,
I implemented 2 null safe methods to replace into a String with regular
expression :
- String replaceAll(String text, String regex, String replacement);
- String replaceFirst(String text, String regex, String replacement);
The StringUtils.replacePattern(String source, String regex, String
replacement) method adds Pattern#DOTALL option by default which may be
undesired. Moreover, this methods is not null safe.
I think it could be added to StringUtils.
I opened a JIRA ticket (LANG-1139) and an associated Pull Request (#92)
There is detail :
/**
* <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);
Regards,
--
Loic Guibert
PGP : 0x65EB4F33
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