references:

convert

capitalize

assert 'Groovy' == 'groovy'.capitalize()

uncapitalize

assert 'groovy'      == 'Groovy'.uncapitalize()
assert 'hello World' == 'Hello World'.uncapitalize()
assert 'hello world' == 'Hello World'.tokenize().collect { it.uncapitalize() }.join(' ')

toLowerCase

assert 'groovy' == 'GRoOvy'.toLowerCase()

toUpperCase

assert 'GROOVY' == 'gRoovy'.toUpperCase()

substring

string indexing

assert '123' == '1234567'[0..2]
assert '67'  == '1234567'[-2..-1]

minus

assert 'Hello ' == 'Hello World'.minus( 'World' )
assert ' World' == 'Hello World'.minus( 'Hello' )
  • or
    assert 'Hello ' == 'Hello World' - 'World'
assert ' World' == 'Hello World' - 'Hello'

take

assert 'G'   == 'Groovy'.take(1)
assert 'Gr'  == 'Groovy'.take(2)
assert 'Gro' == 'Groovy'.take(3)

takeRight

[!TIP] returns the last num elements from this CharSequence.

assert ''    == 'Groovy'.takeRight( 0 )
assert 'y'   == 'Groovy'.takeRight( 1 )
assert 'ovy' == 'Groovy'.takeRight( 3 )

takeAfter

assert ' development. Groovy team' == 'Groovy development. Groovy team'.takeAfter( 'Groovy' )
assert 'team'                      == 'Groovy development. Groovy team'.takeAfter( ' Groovy ' )

takeBefore

assert 'Groovy '            == 'Groovy development. Groovy team'.takeBefore( 'development' )
assert 'Groovy development' == 'Groovy development. Groovy team'.takeBefore( '. Groovy ' )

takeBetween

assert ' development. ' == 'Groovy development. Groovy team'.takeBetween( 'Groovy' )
assert 'marslo'         == 'name = "marslo"'.takeBetween( '"' )

assert '10'  == "t1='10' ms, t2='100' ms".takeBetween( "'"    )
assert '10'  == "t1='10' ms, t2='100' ms".takeBetween( "'", 0 )
assert '100' == "t1='10' ms, t2='100' ms".takeBetween( "'", 1 )

takeWhile

[!TIP] returns the longest prefix of this CharSequence where each element passed to the given closure evaluates to true.

assert ''   == 'Groovy'.takeWhile{ it < 'A'  }
assert 'G'  == 'Groovy'.takeWhile{ it < 'a'  }
assert 'Gr' == 'Groovy'.takeWhile{ it != 'o' }

drop

assert 'ovY' == 'GroovY'.drop(3)
assert ''    == 'GroovY'.drop(10)

dropWhile

[!TIP] create a suffix of the given CharSequence by dropping as many characters as possible from the front of the original CharSequence such that calling the given closure condition evaluates to true when passed each of the dropped characters.

assert 'roovY' == 'GroovY'.dropWhile{ it < 'Z' }

tr

assert 'hEllO' == 'hello'.tr('aeiou', 'AEIOU')
assert 'HELLO' == 'hello'.tr('a-z', 'A-Z'    )

// if replacementSet is smaller than sourceSet, then the last character from replacementSet is used as the replacement for all remaining source characters as shown here:
assert 'HAAAA WAAAA!' == 'Hello World!'.tr('a-z', 'A')

// if sourceSet contains repeated characters, the last specified replacement is used as shown here:
assert 'He224 W4r2d!' == 'Hello World!'.tr('lloo', '1234')

tricky

remove the last x chars

def removeSuffix( String str ) {
  removeSuffix( str, 1 )
}

/**
 * remove the last char of {@code str}
 * @param str       the string will be removal the last char
 * @param c         remove last {@code c} numbers chars
**/
def removeSuffix( String str, int c ) {
  str.reverse().drop(c).reverse()
}

add char(s) in the end of string

str.concat('substr')

comparation

equalsIgnoreCase

assert true == "HELLO World".equalsIgnoreCase( 'hello world' )

compareToIgnoreCase

assert 0 == "Hello World".compareToIgnoreCase( 'hello world' )

repalce

reverse

assert '1234' == '4321'.reverse()

replaceAll

[!TIP] public String replaceAll(Pattern pattern, Closure closure)

  • replaces all occurrences of a captured group by the result of a closure call on that text.
assert 'hellO wOrld'    == 'hello world'.replaceAll(~"(o)") { it[0].toUpperCase() }

assert 'FOOBAR-FOOBAR-' == 'foobar-FooBar-'.replaceAll(~"(([fF][oO]{2})[bB]ar)", { it[0].toUpperCase() })
// Here,
//   it[0] is the global string of the matched group
//   it[1] is the first string in the matched group
//   it[2] is the second string in the matched group

assert 'FOO-FOO-' == 'foobar-FooBar-'.replaceAll("(([fF][oO]{2})[bB]ar)", { x, y, z -> z.toUpperCase() })
// Here,
//   x is the global string of the matched group
//   y is the first string in the matched group
//   z is the second string in the matched group

replaceFirst

[!TIP] public String replaceFirst(CharSequence regex, Closure closure))

  • Replaces the first occurrence of a captured group by the result of a closure call on that text.
assert 'hellO world' == 'hello world'.replaceFirst("(o)") { it[0].toUpperCase() }   // first match
assert 'hellO wOrld' == 'hello world'.replaceAll("(o)")   { it[0].toUpperCase() }   // all matches

assert '1-FISH, two fish' == 'one fish, two fish'.replaceFirst(/([a-z]{3})\s([a-z]{4})/) { [one:1, two:2][it[1]] + '-' + it[2].toUpperCase() }
assert '1-FISH, 2-FISH'   == 'one fish, two fish'.replaceAll(/([a-z]{3})\s([a-z]{4})/)   { [one:1, two:2][it[1]] + '-' + it[2].toUpperCase() }

replaceAll with case-insensitive

[!TIP|label:references:]

EQUIVALENT EMBEDDED FLAG EXPRESSION CONSTANT
None Pattern.CANON_EQ
(?i) Pattern.CASE_INSENSITIVE
(?x) Pattern.COMMENTS
(?m) Pattern.MULTILINE
(?s) Pattern.DOTALL
None Pattern.LITERAL
(?u) Pattern.UNICODE_CASE
(?d) Pattern.UNIX_LINES 
String target                 = '++Apple@@Banana | aPPle##BanANa$$'
Map<String, String> p         = [ 'banana' : '--', 'apple' : '==' ]
assert '++==@@-- | ==##--$$' == p.inject('') { injected, k, v ->
                                  injected = ( injected ?: target ).replaceAll( "(?i)${k}", v );
                                  injected
                                }

  • or

    import java.util.regex.Pattern

String parentPath = 'D:\\ifs\\APP\\Checkout'
String path = 'D:\\IFS\\APP\\Checkout\\trvexp\\client\\Ifs.App\\text.txt'

assert '\\trvexp\\client\\Ifs.App\\text.txt' == path.replaceAll( "(?i)" + Pattern.quote(parentPath), '' )

  • or

    import java.util.regex.Pattern

String label = 'table'
String html  = '<table>aaa</table>'

assert '<WINDOWS>aaa</WINDOWS>' == Pattern.compile(label, Pattern.CASE_INSENSITIVE).matcher(html).replaceAll("WINDOWS");

Apply proper uppercase and lowercase on a String

import java.util.regex.Matcher
import java.util.regex.Pattern

String str = "this is a test"

StringBuffer sb = new StringBuffer()
Matcher m = Pattern.compile("([a-z])([a-z]*)", Pattern.CASE_INSENSITIVE).matcher(str)
while ( m.find() ) {
  m.appendReplacement( sb, m.group(1).toUpperCase() + m.group(2).toLowerCase() )
}
assert 'This Is A Test' == m.appendTail(sb).toString()

split

split string by Capital Letters

[!NOTE|label:references:]

// split by Uppercase
'IWantToSplitThisString'.split("(?=\\p{Lu})")
'IWantToSplitThisString'.split("(?=\\p{Upper})")
// result: ['I', 'Want', 'To', 'Split', 'This', 'String']

// split by Lowercase
'iwANTtOsPLITtHISsTRING'.split("(?=\\p{Ll})")
'iwANTtOsPLITtHISsTRING'.split("(?=\\p{Lower})")
// result: ['i', 'wANT', 'tO', 'sPLIT', 'tHIS', 'sTRING']

  • or via [A-Z]

    assert ['this', 'Is', 'My', 'String'] == "thisIsMyString".split("(?=[A-Z])");

  • or via String.format

    String splitCamelCase(String s) {
  return s.replaceAll(
    String.format("%s|%s|%s",
       "(?<=[A-Z])(?=[A-Z][a-z])",
       "(?<=[^A-Z])(?=[A-Z])",
       "(?<=[A-Za-z])(?=[^A-Za-z])"
    ),
  " "
  );
}

[
  "lowercase",
  "Class",
  "MyClass",
  "HTML",
  "PDFLoader",
  "AString",
  "SimpleXMLParser",
  "GL11Version",
  "99Bottles",
  "May5",
  "BFG9000",
].each { test ->
  System.out.println("${test.padRight(16)}: [" + splitCamelCase(test) + "]");
}
    • result
      lowercase       : [lowercase]
Class           : [Class]
MyClass         : [My Class]
HTML            : [HTML]
PDFLoader       : [PDF Loader]
AString         : [A String]
SimpleXMLParser : [Simple XML Parser]
GL11Version     : [GL 11 Version]
99Bottles       : [99 Bottles]
May5            : [May 5]
BFG9000         : [BFG 9000]

split via patten

[!NOTE|label:expect:]

  • original:
    'h1:aaa:h2:bbb'
  • expect:
    '<h1>aaa</h1><h2>bbb</h2>'

  • via inject

    String title = 'h1:aaa:h2:bbb'
String pattern = 'h\\d'

title.trim().split(':')
      .inject([:]) { injected, str ->
         key = str.matches(pattern) ? str : key
         injected[key] = injected.getOrDefault(key, '') + ( ! str.matches(pattern) ? ":${str}" : '')
         injected
      }
      .collectEntries {[ (it.key), it.value.tokenize(':').join(':') ]}
      .collect { "<${it.key}>${it.value}</${it.key}>" }
      .join()

  • via split

    String title = 'h1:aaa:h2:bbb'

title.trim()
     .split( "(?=h\\d:)" )
     .collect{ it.tokenize(':') }
     .collectEntries{[ (it.first().trim()) : it.last().trim() ]}
     .collect{ "<${it.key}>${it.value}</${it.key}>" }
     .join()

trim

stripIndent()

"""
    try{
        do this
    } finally {
        do that
    }
""".stripIndent()

==> output :
try{
    do this
} finally {
    do that
}

stripMargin()

"""try{
    |    do this
    |} finally {
    |    do that
    |}
""".stripMargin()

==> output :
try{
    do this
} finally {
    do that
}
  • or
    """try{
   *    do this
   *} finally {
   *    do that
   *}
""".stripMargin( '*' )

output format

expand

assert 'Groovy  Grails  Griffon'     == 'Groovy\tGrails\tGriffon'.expand()
assert 'Groovy    Grails    Griffon' == 'Groovy\tGrails\tGriffon'.expand(10)

unexpand

assert 'Groovy\tGrails\tGriffon' == 'Groovy  Grails  Griffon'.unexpand()
assert 'Groovy\tGrails\tGriffon' == 'Groovy    Grails    Griffon'.unexpand(10)

padRright

println 'world******'.padRight(15) + 'hello'
println 'world'.padRight(15) + 'hello'

// result
// world******    hello
// world          hello

  • or

    println 'world******'.padRight(15, '.') + 'hello'
println 'world'.padRight(15, '.') + 'hello'

// result
// world******....hello
// world..........hello

center

println " HEADER ".center(50, "-")
println "Number:".padRight(20)      + "20"
println "Name:".padRight(20)        + "John Doe"
println "Address:".padRight(20)     + "34 Some Street, London"
println "Subscriber:".padRight(20)  + "YES"
println "Expired:".padRight(20)     + "NO"

// result
// --------------------- HEADER ---------------------
// Number:             20
// Name:               John Doe
// Address:            34 Some Street, London
// Subscriber:         YES
// Expired:            NO

size

count

assert 2 == 'Hello world'.count('o')
assert 2 == 'Hello worlld'.count('ll')

size

assert 11 == 'Hello world'.size()
assert 11 == 'Hello world'.length()

random

[!TIP] check also in * imarslo : generate the random String

references:

NOTE:

  • shuffled() supports for Groovy 3+

shuffled

('0'..'z').shuffled().take(10).join()
  • for number and chars only
    (('a'..'z')+('A'..'Z')+(0..9)).shuffled().take(10).join()

file

[!NOTE|label:references:]

IO NIO
File file = new File( 'c:/data' )
file.createNewFile()		 Path path = Paths.get( 'c:/data' )
Files.createFile(path)
File file = new File( 'c:/data' )
file.mkdir()		 Path path = Paths.get( 'c:/data' )
Files.createDirectory(path)
File file = new File( 'c:/data' )
file.mkdirs()		 Path path = Paths.get( 'c:/data' )
Files.createDirectories(path)
File file = new File( 'c:/data' )
file.exists()		 Path path = Paths.get( 'c:/data' )
Files.exists(path)

  • dirname

    # via File
assert '/a/b/c' == ( new File('/a/b/c/d.txt') ).getParentFile().toString()
assert '/a/b/c' == ( new File('/a/b/c/d.txt') ).getParent()
assert '/a/b/c' == ( new File('/a/b/c/d.txt') ).parent

# via java.nio.file.Paths
assert '/a/b/c' == java.nio.file.Paths.get( '/a/b/c/d.txt' ).getParent().toString()
assert '/a/b/c' == jhava.nio.file.Paths.get( '/a/b/c/d.txt' ).parent.toString()

  • basename

    # via File
assert 'd.txt' == (new File('/a/b/c/d.txt')).getName()
assert 'd.txt' == (new File('/a/b/c/d.txt')).name

# via java.nio.file.Paths
assert 'd.txt' == java.nio.file.Paths.get( '/a/b/c/d.txt' ).getFileName().toString()
assert 'd.txt' == java.nio.file.Paths.get( '/a/b/c/d.txt' ).fileName.toString()

  • isDirectory || isFile

    assert true  == ( new File('/Users/marslo/.vimrc') ).isFile()
assert false == ( new File('/Users/marslo/.vimrc') ).isDirectory()

StringTokenizer

[!NOTE|label:references:]

import java.util.StringTokenizer

StringTokenizer st = new StringTokenizer("this is a test");
while (st.hasMoreTokens()) { System.out.println(st.nextToken()); }

  • output

    this
is
a
test

  • equals

    String[] result = "this is a test".split("\\s");
for (int x=0; x<result.length; x++)
    System.out.println(result[x]);
Copyright © marslo 2020-2023 all right reserved，powered by GitbookLast Modified: 2024-03-12 15:01:28

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