Matching Simple Strings

The simplest and most common type of regex is an alphanumeric string that matches itself, called a "literal text match". A literal text regex matches anywhere along a string. For example, a literal string matches itself when placed alone, and at the beginning, middle, or end of a larger string. Literal text matches are case sensitive.

Using regexes to search for simple strings.

Example 1: Search for the string "at".

Regex:
```
at
```
Matches:
```
at
math
hat
ate
```
Doesn't Match:
```
it
a-t
At
```

Example 2: Search for the string "email".

Regex:
```
email
```
Matches:
```
email
emailing
many_emails
```
Doesn't Match:
```
Email
EMAILing
e-mails
```

Example 3: Search for the string "abcdE567".

Regex:
```
abcdE567
```
Matches:
```
abcdE567
AabcdE567ing
text_abcdE567
```
Doesn't Match:
```
SPAMabCdE567
ABCDe567
```

Note

Regular expressions are case sensitive unless case is deliberately modified.