xslt best match with regular expression logic

all frequently used regular expression to find specifc words aroud 20 examples ; example emailid 

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20 Frequently Used Regular Expressions

Here are some common regular expressions with explanations and examples:

Matching Specific Patterns

Email Address:

Code snippet

\b[\w.-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}\b

Use code with caution.

Matches strings like john.doe@example.com, jane_smith123@gmail.com.

Phone Number:

Code snippet

\d{3}-\d{3}-\d{4}

Use code with caution.

Matches US phone numbers like 123-456-7890.

URL:

Code snippet

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

Use code with caution.

Matches URLs like https://www.example.com, http://google.com.

Date:

Code snippet

\d{2}\/\d{2}\/\d{4}

Use code with caution.

Matches dates like 01/01/2024.

Time:

Code snippet

\d{2}:\d{2}:\d{2}

Use code with caution.

Matches times like 12:34:56.

Character Classes and Quantifiers

Alphanumeric Characters:

Code snippet

\w+

Use code with caution.

Matches one or more alphanumeric characters.

Non-alphanumeric Characters:

Code snippet

\W+

Use code with caution.

Matches one or more non-alphanumeric characters.

Digits:

Code snippet

\d+

Use code with caution.

Matches one or more digits.

Non-digit Characters:

Code snippet

\D+

Use code with caution.

Matches one or more non-digit characters.

Whitespace Characters:

Code snippet

\s+

Use code with caution.

Matches one or more whitespace characters (spaces, tabs, newlines).

Non-whitespace Characters:

Code snippet

\S+

Use code with caution.

Matches one or more non-whitespace characters.

Anchors

Start of a Line:

Code snippet

^

Use code with caution.

Matches the beginning of a line.

End of a Line:

Code snippet

$

Use code with caution.

Matches the end of a line.

Grouping and Alternation

Grouping:

Code snippet

(abc)

Use code with caution.

Groups characters together.

Alternation:

Code snippet

(cat|dog)

Use code with caution.

Matches either "cat" or "dog".

Character Sets

Character Set:

Code snippet

[abc]

Use code with caution.

Matches any single character from the set a, b, or c.

Negated Character Set:

Code snippet

[^abc]

Use code with caution.

Matches any single character except a, b, or c.

Quantifiers

Zero or More:

Code snippet

a*

Use code with caution.

Matches zero or more as.

One or More:

Code snippet

a+

Use code with caution.

Matches one or more as.

Zero or One:

Code snippet

a?

Use code with caution.

Matches zero or one a.

Remember that regular expressions can be combined in various ways to create complex patterns. Practice and experimentation are key to mastering regular expressions.