Folio3 is a development partner that focuses on designing custom enterprise, mobile, and social media applications. It was founded in 2005 and has over 200 employees across offices in the US, Canada, Bulgaria, and Pakistan. Folio3 provides services for areas like enterprise solutions, mobile apps, and websites. Some of its clients include companies in healthcare, digital media, and supply chain industries. The document then provides an overview of regular expressions including literal characters, special characters, character classes, grouping, backreferences, and lookarounds.

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www.folio3.com@folio_3

2. Folio3 – OverviewFolio3 – Overview
www.folio3.com @folio_3

3. Who We Are
 We are a Development Partner for our customers
 Design software solutions, not just implement them
 Focus on the solution – Platform and technology agnostic
 Expertise in building applications that are:
Mobile Social Cloud-based Gamified

4. What We Do
 Areas of Focus
 Enterprise
 Custom enterprise applications
 Product development targeting the enterprise
 Mobile
 Custom mobile apps for iOS, Android, Windows Phone, BB OS
 Mobile platform (server-to-server) development
 Social Media
 CMS based websites for consumers and enterprise (corporate, consumer,
community & social networking)
 Social media platform development (enterprise & consumer)

5. Folio3 At a Glance
 Founded in 2005
 Over 200 full time employees
 Offices in the US, Canada, Bulgaria & Pakistan
 Palo Alto, CA.
 Sofia, Bulgaria
 Karachi, Pakistan
Toronto, Canada

6. Areas of Focus: Enterprise
 Automating workflows
 Cloud based solutions
 Application integration
 Platform development
 Healthcare
 Mobile Enterprise
 Digital Media
 Supply Chain

7. Some of Our Enterprise Clients

8. Areas of Focus: Mobile
 Serious enterprise applications for Banks,
Businesses
 Fun consumer apps for app discovery,
interaction, exercise gamification and play
 Educational apps
 Augmented Reality apps
 Mobile Platforms

9. Some of Our Mobile Clients

10. Areas of Focus: Web & Social Media
 Community Sites based on
Content Management Systems
 Enterprise Social Networking
 Social Games for Facebook &
Mobile
 Companion Apps for games

11. Some of Our Web Clients

12. Regular Expression inRegular Expression in
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www.folio3.com @folio_3

13. Agenda
 What are Regular Expressions
 Literal characters and Special characters
 Build blocks of Regular Expressions
 Grouping and Backreferences
 Unicode characters in regular expressions
 Regex Matching Modes
 Lookarounds
 Parse a log file…

14. What are Regular Expressions?
 Regular expressions provide a concise and flexible means for
matching strings of text, such as particular characters, words,
or patterns of characters.

15. Literal and Special characters
 The most basic regular expression consists of a literal which
behaves just like string matching. For e.g.
 cat will match cat in About cats and dogs.
 Special characters known as meta characters needs to be
escaped with a in regular expressions if they are used as
part of a literal:
 dogs. will match dogs. in About cats and dogs.
 Meta characters are:
 [ ^ $ . | ? * + ( ) {

16. Character Classes and Shorthands
 With a "character class", also called "character set", you can tell
the regex engine to match only one out of several characters. For
e.g.
 gr[ae]y will match grey and gray both.
 Ranges can be specified using dash. For e.g.
 [0-9] will match any digit from 0 to 9.
 [0-9a-fA-F] will match any single hexadecimal digit.
 Caret after the opening square bracket will negate the character
class. The result is that the character class will match any
character that is not in the character class. For e.g.
 [^0-9] will match any thing except number.
 q[^u] will not match Iraq but it will match Iraq is a country

17. Character Classes and Shorthands
 Meta characters works fine without escaping in Character classes.
For e.g.
 [+*] is a valid expression and match either * or +.
 There are some pre-defined character classes known as short
hand character classes:
 w stands for [A-Za-z0-9_]
 s stands for [ trn]
 d stands for [0-9]
 If a character class is repeated by using the ?, * or + operators,
the entire character class will be repeated, and not just the
character that it matched. For e.g.
 [0-9]+ can match 837 as well as 222
 ([0-9])1+ will match 222 but not 837.

18. Building blocks of Regular Exp.
 The famous dot “.” operator matches anything. For e.g.
 a.b will match abb, aab, a+b etc.
 ^ and $ are used to match start and end of regular expressions.
For e.g.
 ^My.*.$ will match anything starting with My and ending
with a dot.
 Pipe operator is used to match a string against either its left or
the right part. For e.g.
 (cat|dog) can match both cat or dog.
 Question:
 If the expression is Get|GetValue|Set|SetValue and string
is SetValue. What will this match and why?
 What if the expression becomes Get(Value)?|Set(Value)?
 * or {0,} and + or {1,} are used to control repititions.

19. Grouping and Backreferences
 Round brackets besides grouping part of a regular expression
together, also create a "backreference". A backreference stores
the matching part of the string matched by the part of the regular
expression inside the parentheses. For e.g.
 ([0-9])1+ will match 222 but not 837.
 If backreference are not required, you can optimize this regular
expression Set(?:Value)?
 Backreferences can be used in expressions itself or in
replacement text. For e.g.
 <([A-Za-z][A-Za-z0-9]*)>.*</1> will match matching opening
and closing tags.

20. Unicode characters in Regular Exp.
 Unicode characters can be used as uxxxx in regular expressions.
For e.g.
 ‫عطاری‬ cat be matched in an expression as:
u0639u0637u0627u0631u06cc

21. Regular Exp. Matching Modes
 /i makes the regex match case insensitive.
 [A-Z] will match A and a with this modifier.
 /s enables "single-line mode". In this mode, the dot matches newlines as well.
 .* will match sherazrnattari with this modifier.
 /m enables "multi-line mode". In this mode, the caret and dollar match before
and after newlines in the subject string.
 .* will match only sheraz in sherazrnattari with this modifier.
 /x enables "free-spacing mode". In this mode, whitespace between regex
tokens is ignored, and an unescaped # starts a comment.
 #sherazrnrn.* will match only sheraz in with this modifier.

22. Lookarounds with Conditions…
 A conditional is a special construct that will first evaluate a lookaround, and
then execute one sub-regex if the lookaround succeeds, and another sub-
regex if the lookaround fails.
 Example of Positive lookahead is:
 q(?=uv*) will match q in quvvvv and qu.
 Example of Negative lookahead is:
 q(?!uv*) will match q not followed by u and uv.
 Example of Positive lookbehind is:
 (?<=b)a will match a prefixed by b like ba.
 Example of Negative lookbehind is:
 (?<!b)a will match a not prefixed by b like ca and da etc.

23. Contact
 For more details about our
services, please get in touch with
us.
contact@folio3.com
US Office: (408) 365-4638
www.folio3.com