Update Ruby Regex.md

examples/Regex Examples/Ruby Regex.md

@@ -1,94 +1,86 @@
 Some simple examples for using regular expressions in Ruby scripts.
 
-## Regular Expressions
-
-### 1\. Syntax
+## 1. Syntax
 
 Compared to other scripting languages Ruby more behaves like [Perl](Perl) allowing to use regex seemlessly without the need for explicit objects in Python or a function in PHP. So you can just match something with putting a regular expression between two slashes:
 
-<pre class="brush:php">/search string/</pre>
+    /search string/
 
-### 2\. Simple String Checks
+## 2. Simple String Checks
 
 Here are some syntax examples that check strings for certain content:
 
-#### Basic Matching
-
-<pre class="brush:php">text =~ /Ruby/       # Match for an unbound literal
-text =~ /^Ruby/      # Match literal at start of string
-text =~ /Ruby$/      # Match literal at end of string
-text =~ /^Ruby$/     # Match for exact string content
-text =~ /^$/         # Match empty string
-</pre>
+### Basic Matching
+
+    text =~ /Ruby/       # Match for an unbound literal
+    text =~ /^Ruby/      # Match literal at start of string
+    text =~ /Ruby$/      # Match literal at end of string
+    text =~ /^Ruby$/     # Match for exact string content
+    text =~ /^$/         # Match empty string
 
-#### Using different regex delimiters
+### Using different regex delimiters
 
-<pre class="brush:php">%r/Ruby/               # / as commonly used delimiter
-%r@Ruby@               # @ as delimiter
-%r!Ruby!               # ! as delimiter
-</pre>
+    %r/Ruby/               # / as commonly used delimiter
+    %r@Ruby@               # @ as delimiter
+    %r!Ruby!               # ! as delimiter
 
-#### Changing the delimiter becomes useful in some cases
+### Changing the delimiter becomes useful in some cases
 
-<pre class="brush:php">"http://" =~ /http:\/\//     # match http:// protocol prefix with / delimiter
-"http://" =~ %r#http://#     # match http:// protocol prefix with # delimiter
-</pre>
+    "http://" =~ /http:\/\//     # match http:// protocol prefix with / delimiter
+    "http://" =~ %r#http://#     # match http:// protocol prefix with # delimiter
 
-#### Case sensitity
+### Case sensitity
 
-<pre class="brush:php">text =~ /Ruby/                # case sensitive string matching
-text =~ /ruby/i               # case in-sensitive string matching
-</pre>
+    text =~ /Ruby/                # case sensitive string matching
+    text =~ /ruby/i               # case in-sensitive string matching
 
-#### Matching with wildcards
+### Matching with wildcards
 
-<pre class="brush:php">"Ruby" =~ /R..y/            # match a single character with .
-"Ruby" =~ /R.*y/            # match multipe characters
-"Ruby" =~ /R[a-z]y/         # match from character range a-z
-"Rbuy" =~ /[Ruby]*/         # match from character set R,u,b and y
-"Ruby" =~ /R\wy/            # match one word character
-"regex in Ruby" =~ /\bRuby\b/"   # match the word "Ruby", but not "Ruby" as larger string
-</pre>
+    "Ruby" =~ /R..y/            # match a single character with .
+    "Ruby" =~ /R.*y/            # match multipe characters
+    "Ruby" =~ /R[a-z]y/         # match from character range a-z
+    "Rbuy" =~ /[Ruby]*/         # match from character set R,u,b and y
+    "Ruby" =~ /R\wy/            # match one word character
+    "regex in Ruby" =~ /\bRuby\b/"   # match the word "Ruby", but not "Ruby" as larger string
 
-#### Using quantifiers
+### Using quantifiers
 
-<pre class="brush:php">"Ruby" =~ /[Ruby]{4}/          # match exactly 4 characters from set [Ruby]
-"Ruby" =~ /[Ruby]{4,4}/        # match exactly 4 characters from set [Ruby]
-"Ruby" =~ /[Ruby]{,3}/         # match at most 3 characters from set [Ruby]
-"Ruby" =~ /[Ruby]{3,}/         # match at least 3 characters from set [Ruby]
-</pre>
+    "Ruby" =~ /[Ruby]{4}/          # match exactly 4 characters from set [Ruby]
+    "Ruby" =~ /[Ruby]{4,4}/        # match exactly 4 characters from set [Ruby]
+    "Ruby" =~ /[Ruby]{,3}/         # match at most 3 characters from set [Ruby]
+    "Ruby" =~ /[Ruby]{3,}/         # match at least 3 characters from set [Ruby]
 
-### 3\. Replacing Patterns
+## 3. Replacing Patterns
 
-You need to do substitution using the in place string object methods sub!() for replacing first occurence and gsub!() for replacing all occurences:
+You need to do substitution using the in place string object methods `sub!()` for replacing first occurence and `gsub!()` for replacing all occurences:
 
-<pre class="brush:php">text.sub!(/Rbuy/, "Ruby")</pre>
+    text.sub!(/Rbuy/, "Ruby")
 
-### 4\. Capture Groups
+## 4. Capture Groups
 
 To extract data using regular expression we have to use capture/grouping syntax and
 
-*   **to do exactly one match:** the String#match method and MatchData#captures to produce a result array
-*   **to do multiple matches:** the String#scan method which returns a nested array with an result array for each match
+- **to do exactly one match:** the String#match method and MatchData#captures to produce a result array
+- **to do multiple matches:** the String#scan method which returns a nested array with an result array for each match
+
+Some basic examples to do the exactly one match with `String#match`
+
+Extract everything after the literal "START"
+
+    if result = line.match(/START(.*)/")
+       text = result.captures
+    end
 
-Some basic examples to do the exactly one match with String#match
+Extract the number from a date string "2012-10-20"
 
-<pre class="brush:php"># Extract everything after the literal "START"
-if result = line.match(/START(.*)/")
-   text = result.captures
-end
-</pre>
+    if result = line.match(/(\d{4})-(\d{2})-(\d{2})/)
+      year, week, day = result.captures
+    end
 
-<pre class="brush:php"># Extract the number from a date string "2012-10-20"
-if result = line.match(/(\d{4})-(\d{2})-(\d{2})/)
-  year, week, day = result.captures
-end
-</pre>
+Nesting of capture groups, extract full name, and both parts... string "name is Doe, John"
 
-<pre class="brush:php"># Nesting of capture groups, extract full name, and both parts... string "name is Doe, John"
-if result = line.match(/name is ((\w+), (\w+))/)
-  fullname, firstname, lastname = result.capture
-end
-</pre>
+    if result = line.match(/name is ((\w+), (\w+))/)
+      fullname, firstname, lastname = result.capture
+    end
 
 Ensure always to check for nil result if the match might fail!