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StringTools

  

Select

  

select characters from a string

  

Remove

  

remove characters from a string

  

SelectRemove

  

split a string into two according to a predicate

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

Select(p, s)

Remove(p, s)

SelectRemove(p, s)

Parameters

p

-

Maple procedure that evaluates to either true or false; predicate that characters in the string must satisfy

s

-

Maple string

Description

• 

The Select( p, s ) function returns the characters in string s that satisfy the specified predicate p.

• 

The first argument p must be a Maple procedure that returns either true or false. Procedure p is applied to each character in string s. The Select function returns the concatenation of all the characters from it for which the procedure p returns true.

• 

The Remove( p, s ) function returns the characters in string s that do not satisfy the specified predicate p.

• 

The first argument p must be a Maple procedure that returns either true or false. Procedure p is applied to each character in string s. The Remove function returns the concatenation of all the characters from it for which the procedure p returns false.

• 

The SelectRemove( p, s ) function is equivalent to:

SelectRemovep,s=Selectp,s,Removep,s

• 

If p returns a value other than true or false, an exception is raised.

• 

These functions are part of the StringTools package, and so they can be used in the form Select(..) only after executing the command with(StringTools). However, they can always be accessed through the long form of the command by using the form StringTools[Select](..).

  

Note: These functions are analogous to the select, remove, and selectremove functions.

Examples

withStringTools:

SelectIsUpper,CapitalizeThis is a test.

TIAT

(1)

sRandom1000:

tSelectIsAlphaNumeric,s:

lengths,lengtht

1000,258

(2)

RemoveIsVowel,Some people contend that in the English language vowels are superfluous.

Sm ppl cntnd tht n th nglsh lngg vwls r sprfls.

(3)

SelectRemoveIsUpper,CapitalizeThis is a test.

TIAT,his s est.

(4)

See Also

length

member

remove

select

selectremove

StringTools

StringTools[Capitalize]

StringTools[IsAlphaNumeric]

StringTools[IsUpper]

StringTools[IsVowel]

StringTools[Random]