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Week 6

## E-mail Validation

## Regular Expressions

> Regular expression is a **special text** string for describing a **search pattern**.

    ^([a-z\d\._-]+@([a-z\d-]+\.)+[a-z]{2,6})$

## Regexp Validators * http://rexv.org * https://regex101.com/ * `grep`, `grep -E`, `egrep`

## POSIX ## PCRE

## Regexp are Case Sensitive

## Every Character Counts

## Metacharacters

## Escaping

## AB123CD

## Character Classes

    [ABCDEFGHIJKLMNOPQRSTUVWXYZ]
[0123456789]

    [ABCDEFGHIJKLMNOPQRSTUVWXYZ][ABCDEFGHIJKLMNO
PQRSTUVWXYZ][0123456789][0123456789][0123456
789][ABCDEFGHIJKLMNOPQRSTUVWXYZ][ABCDEFGHIJK
LMNOPQRSTUVWXYZ]

    [A-Z][A-Z][0-9][0-9][0-9][A-Z][A-Z]

    [A-Za-z0-9_]

    [^A-Za-z0-9_]

    [A-Z][A-Z][0-9][0-9][0-9][A-Z][A-Z]

## Character Repetition * ``{n}`` - `n` times * ``{n,}`` - min. `n` times * ``{n,m}`` - min. `n` times and max. `m` times

    [A-Z]{2}[0-9]{3}[A-Z]{2}

## Quantifiers

    07.04.2016 12:00:29

## Groupping Patterns

    (07.04.2016) (12:00:29)

    (07).(04).(2016) (12):(00):(29)

    ((07).(04).(2016)) ((12):(00):(29))

## Matching Alternatives

## Regular Expressions in C

## Examples

## Questions?

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Case insensitive

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