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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4613
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
A regular expression is a special sequence of characters that helps us match or find other strings or sets of strings, using a specialized syntax held in a pattern.
 
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#4614
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
A regular expression literal is a pattern between slashes or between arbitrary delimiters followed by %r.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Regular-expression modifiers

Regular expression literals may include an optional modifier to control various aspects of matching.
 
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#4616
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Like string literals delimited with %Q, Ruby allows us to begin our regular expressions with %r followed by a delimiter of our choice.

This is useful when the pattern we are describing contains a lot of forward slash characters that we don't want to escape
 
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#4617
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Regular-expression patterns

Except for control characters, (+ ? . * ^ $ ( ) [ ] { } | \), all characters match themselves.egular-expression patterns

Except for control characters, (+ ? . * ^ $ ( ) [ ] { } | \), all characters match themselves.

We can also escape a control character by preceding it with a backslash.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Some of the most important String methods that use regular expressions are sub and gsub , and their in-place variants sub! and gsub!.
 
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