Android Question RegexBuilder - dividing the string into parts

kisoft · Dec 7, 2018

Hi
How to divide a string into parts using this class?
https://www.b4x.com/android/forum/t...uilder-for-regular-expressions.83495/#content

For example:

B4X:

dim str as string= "aaa.bbb.ccc"
dim a,b,c as string

'I would like to get three variables
a = aaa
b = bbb
c = ccc

udg · Dec 7, 2018

In that simple case you can just copy&paste code from the Splitting section of this tutorial by Erel: https://www.b4x.com/android/forum/threads/b4x-regular-expressions-regex-tutorial.7123/#content

kisoft · Dec 7, 2018

Thank you for your response.
I know this can be done for example:

B4X:

         dim a,b,c as string

    Dim data As String
    data = "aaa.bbb.ccc
    Dim numbers() As String
    numbers = Regex.Split("\.", data)
    Dim l As List
    l.Initialize2(numbers)
     a=l.Get(0)
     b=l.Get(1)
     c=l.Get(2)

is it possible to do this with this class?
https://www.b4x.com/android/forum/t...uilder-for-regular-expressions.83495/#content

it divides the string into parts but I would like to assign them to variables a, b, c

B4X:

dim a,b,c as string
dim str as string= "aaa.bbb.ccc''
Dim rx As RegexBuilder
    For Each s As String In Regex.Split(rx.Initialize.AppendEscaped(".").Pattern, str )
    Log(s)
   Next

sorex · Dec 7, 2018

you probably end up with more code than your example above it unless you store them in an array/list/map.

by the way... that list is not even needed so you can remove 2 lines there and use a=numbers(0) instead.

Erel · Dec 9, 2018

The purpose of RegexBuilder is to help you build the pattern. Once you got the pattern you use the regular Regex methods.

B4X:

Dim a,b,c As String
Dim data As String = "aaa.bbb.ccc"
Dim builder As RegexBuilder
Dim numbers() As String = Regex.Split(builder.Initialize.AppendEscaped(".").Pattern, data)
Dim l As List
l.Initialize2(numbers)
a=l.Get(0)
b=l.Get(1)
c=l.Get(2)

kisoft · Dec 9, 2018

OK thank you

Mahares · Dec 9, 2018

Erel said:
Dim a,b,c As String
Dim data As String = "aaa.bbb.ccc"
Dim builder As RegexBuilder
Dim numbers() As String = Regex.Split(builder.Initialize.AppendEscaped(".").Pattern, data)
Dim l As List
l.Initialize2(numbers)
a=l.Get(0)
b=l.Get(1)
c=l.Get(2)

Why do you insist on using a list in this case when:

B4X:

a=numbers(0)
b=numbers(1)
c=numbers(2)

and uses fewer lines of code.

Erel · Dec 9, 2018

There is actually never any good reason to use List.Initialize2. It is equivalent to:

B4X:

Dim l As List = numbers

Android Question RegexBuilder - dividing the string into parts

kisoft

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udg

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kisoft

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sorex

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Erel

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kisoft

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Mahares

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