StringTools - Maple Programming Help

Online Help

All Products    Maple    MapleSim


Home : Support : Online Help : Programming : Names and Strings : StringTools Package : Character Class Tests : StringTools/IsLower

StringTools

  

IsLower

  

determine if a character is lowercase

  

IsUpper

  

determine if a character is uppercase

  

IsAlpha

  

determine if a character is alphabetic

 

Calling Sequence

Parameters

Description

Thread Safety

Examples

Calling Sequence

IsLower(char)

IsUpper(char)

IsAlpha(char)

Parameters

char

-

string; character to test

Description

• 

The IsLower(char) command determines whether char is a lowercase letter. A character is lowercase if it is one of the following:

a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z.

  

If char is a lowercase letter, then IsLower returns true. Otherwise, false is returned.

• 

The IsUpper(char) command determines whether char is an uppercase letter. A character is uppercase if it is one of the following:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.

  

If char is an uppercase letter, then IsUpper returns true. Otherwise, false is returned.

• 

The IsAlpha(char) command determines whether char is an alphabetic character. A character is alphabetic if it is either upper or lowercase.

  

If char is an alphabetic character, IsAlpha returns true. Otherwise, false is returned.

• 

For these procedures, if char is a string that contains more than one character, then all the characters in the string are tested. The procedures returns true if the condition is true of all characters in the input string. For the empty string, the tested condition is vacuously true.

Thread Safety

• 

The StringTools[IsLower], StringTools[IsUpper] and StringTools[IsAlpha] commands are thread-safe as of Maple 15.

• 

For more information on thread safety, see index/threadsafe.

Examples

withStringTools:

sconvert`$`1..255,'bytes':

lengths

255

(1)

SelectIsUpper,s

ABCDEFGHIJKLMNOPQRSTUVWXYZ

(2)

SelectIsLower,s

abcdefghijklmnopqrstuvwxyz

(3)

SelectIsAlpha,s

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

(4)

See Also

convert

length

string

StringTools

StringTools[HasAlpha]

StringTools[HasLower]

StringTools[HasUpper]

StringTools[IsAlphaNumeric]

StringTools[LowerCase]

StringTools[Select]

StringTools[UpperCase]