Add documentation for str_contain()/str_equal()/str_match() Fix conditionals. (#246)

Author: blackwinter

README.md

@@ -735,6 +735,10 @@ Executes the functions if/unless the field contains the value. If it is an array
 
 Executes the functions if/unless the field does not contain the value. If it is an array or a hash none of the field values may contain the string.
 
+##### `str_contain`
+
+Executes the functions if/unless the first string contains the second string.
+
 #### `equal`
 
 ##### `all_equal`
@@ -749,6 +753,10 @@ Executes the functions if/unless the field value equals the string. If it is an
 
 Executes the functions if/unless the field value does not equal the string. If it is an array or a hash none of the field values may equal the string.
 
+##### `str_equal`
+
+Executes the functions if/unless the first string equals the second string.
+
 #### `exists`
 
 Executes the functions if/unless the field exists.
@@ -781,6 +789,10 @@ Executes the functions if/unless the field value matches the regular expression
 
 Executes the functions if/unless the field value does not match the regular expression pattern. If it is an array or a hash none of the field values may match the regular expression pattern.
 
+##### `str_match`
+
+Executes the functions if/unless the string matches the regular expression pattern.
+
 ## Xtext
 
 This repo has been originally set up with [Xtext](https://www.eclipse.org/Xtext/) 2.17.0 and Eclipse for Java 2019-03, following [https://www.eclipse.org/Xtext/documentation/104_jvmdomainmodel.html](https://www.eclipse.org/Xtext/documentation/104_jvmdomainmodel.html).