Regular Expressions

Using the Test Method

Match Literal Strings

Match a Literal String with Different Possibilities

Ignore Case While Matching

Extract Matches

Find More Than the First Match

Match Anything with Wildcard Period

Match Single Character with Multiple Possibilities

Match Letters of the Alphabet

Match Numbers and Letters of the Alphabet

Match Single Characters Not Specified

Match Characters that Occur One or More Times

Match Characters that Occur Zero or More Times

Find Characters with Lazy Matching

Find One or More Criminals in a Hunt

Match Beginning String Patterns

Match Ending String Patterns

Match All Letters and Numbers

Match Everything But Letters and Numbers

Match All Numbers

Match All Non-Numbers

Restrict Possible Usernames

Match Whitespace

Match Non-Whitespace Characters

Specify Upper and Lower Number of Matches

Specify Only the Lower Number of Matches

Specify Exact Number of Matches

Check for All or None

Positive and Negative Lookahead

Reuse Patterns Using Capture Groups

Use Capture Groups to Search and Replace

Remove Whitespace from Start and End