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String Recipes

Introduction

A string is a sequence of characters. A string is written by enclosing the characters with a doublequote ("). Some special characters must be preceded by a backslash, these include doublequote and backslash. The technique of marking special characters are called escaping and backslash it self is called an escape character.

Examples of literal strings:

   "Hello world"
   "This string has a \" in it"
   "This character \\ is a slash"

In Scheme, strings are sequences of characters. Since you can't talk about strings without talking about characters, you should know that mzScheme supports the Basic Latin and Latin-1 Supplement, AKA ISO-8859-1. There's work being done to extend the range of valid characters, but at the moment this is what's available. You can specify a literal character with the sequence #\ followed by the character, i.e.

> #\A
#\A
> #\a
#\a
> #\*
#\*

Recipes

• String Basics

• Testing Whether an Object is a String

• Accessing Substrings

• Converting Between Strings and Symbols

• Converting Between ASCII Characters and Values

• Processing a String One Character at a Time

• Reversing a String by Words or Characters

• Expanding and Compressing Tabs

• Controlling Case

• Interpolating Functions and Expressions Within Strings

• Evaluating Scheme Code in a String

• Aligning Strings

• Changing the Indentation of a String

• Trimming Blanks from the Ends of a String

• Combining Strings

• Comparing Strings

• Checking a String for a Character

• Filtering a String for a Set of Characters

• Formatting Scheme Code

• Testing Whether a String Represents an Integer

• Decoding Binary Messages

• Processing Comma Separated Values

• Soundex Matching

Other recipes of interest

• StringRecipeSortingListOfStrings
• File operations

References

• String section of R5RS
• Strings in MzScheme
• String Libraries
• Basic String Ports
• Character-set Library

Comment the recipes here

See the String section of the CommonLispCookBook for inspiration for more recipes.

Contributors

-- GordonWeakliem - 05 Apr 2004

-- BrentAFulgham - 18 May 2004