Regular Expression for Network Engineer Part-1

A regular expression is set of pattern used to define certain amount of text. An powerful  tool in any scripting language to match any pattern.

Lets have a look , how regular expression can be used in Python to solves the problem. Module “re’ is imported in python to support regular expression .

<< import re >>

[  ] – its for specifying character class, individual char or range of character can be mached .

• [123] will match any of the character ‘1’,’2′,’3′
• [1-3] will match any of the character  ‘1’,’2′,’3′
• [a-d] will match any of the character a,b,c,d
• [a-z] will match lowercase
• [A-Z] will match uppercase
• [^6] will match any character except 6
• [a-zA-Z0-9] will match any alphanumeric character
• [^a-zA-Z0-9] will not match any alphanumeric character
•  [a-zA-Z0-9] is equivalent to \w
•  [^a-zA-Z0-9] is equivalent to \W
• [0-9] is equivalent to \d
• [^0-9] is equivalent to \D
• [  \t\n\r\f\v] is equivalent to \s
• [ ^ \t\n\r\f\v] is equivalent to \S

. – Period character ,use for matching any single charcter

• EXAMPLE :

[code language=”python”]

In [225]: ip =’10.20.30.40′
In [226]: re.search(r”.”,ip)
Out[226]:&lt;_sre.SRE_Match object; span=(0, 1), match=’1’_>
In [227]: re.search(r”.”,ip).group(0)
Out[227]: ‘1’

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OpenStack Makes its Open Source CI/CD Platform Available to the Wider World

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Introducing: The Cloudflare All-Stars Fantasy League

Tweet #CloudflareAllStars

Baseball season is well underway, and to celebrate, we're excited to introduce the Cloudflare All-Stars Fantasy League: a group of fictitious sports teams that revolve around some of Cloudflare’s most championed products and services. Their mission? To help build a better Internet.

Cloudflare HQ is located just a block away from the San Francisco Giants Stadium. Each time there's a home game, crowds of people walk past Cloudflare's large 2nd street windows and peer in to the office space. The looks in their eyes scream: "Cloudflare! Teach me about your products while giving me something visually stimulating to look at!"

They asked. We listened.

The design team saw a creative opportunity, seized it, and hit it out of the park. Inspired by the highly stylized sports badges and emblems of some real-life sports teams, we applied this visual style to our own team badges. We had a lot of fun coming up with the team names, as well as figuring out which visuals to use for each.

For the next few months, the Cloudflare All-Stars teams will be showcased within the large Cloudflare HQ windows facing 2nd street and en route to Giants Stadium. Feel free to Continue reading

Worth Reading: Boosting Security with Adjuvants

In medical treatment there is a concept of an “adjuvant” — an agent that enhances the effect of other agents. It’s not the cure, but it helps the cure be more effective. Adjuvants are added to medicines to enhance their responses and lengthen their effect. We can use this same concept for security work —Raymond Pompon @Dark Reading

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The Network Collective: State of the Podcast

In this edition of the Network Collective, Eyvonne, Jordan, and I talk about where the ‘cast has been, and share some thoughts on where it is going. While we like technology as much as anyone else, the NC is really all about community.

In particular, we discuss the upcoming subscription service. We have a lot of new, exciting, material being recorded around the skills needed to be a better engineer exclusively for the subscription service. For instance, we’ve started a series on communication that does not take the standard line, but looks at how to communicate from the perspective of our experience in living on every possible side of the network engineering world, and developing and delivering every possible kind of content. And we have our first Q&A guest lined up, as well as a lot of fantastic material from Rachel Traylor already being recorded. This is going to be fantastic material, designed to push your career forward in a way that includes technology, but goes beyond technical skills, as well.

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Worth Reading: Increasing Bandwidth Demands

More fiber almost always solves bandwidth problems. When in doubt, lay more fiber. Fiber is king, there is no issue here with that assertion. In fact, the entire wireless spectrum can be contained in a single fiber optic cable. —Steve Daigle @Cisco

SSDs get bigger, while prices get smaller

With so much going on in the enterprise storage world, two bits of good news have come out — and it’s only Tuesday. Capacity is going up, and prices are coming down.According to the report from DRAMeXchange, the enterprise SSD market has been growing fast. It projects enterprise SSD sales to top 30 million units this year, up from fewer than 20 million units in 2016, and that rate of growth is expected to continue in the next three years.That’s despite tight supply for memory chips in the first quarter resulting in high average selling prices. For the second quarter, which we are in the midst of, DRAMeXchange expects a rebound in demand due to increased supply.To read this article in full, please click here

IDG Contributor Network: Build your technology layers on a cloud data foundation

The modern enterprise is comprised of a complex set of application stacks that span a disparate variety of virtual machines, physical servers, and proprietary storage hardware. Tentacles reach from headquarters, branch and remote offices, and offshore facilities around the world to technology stacks, SaaS providers and a multitude of applications.Over the years layer after layer of technology has accumulated, but rather than replace what came before, we simply built on top through a long series of incremental decisions and implementations. For many, mainframes were bolstered by a client-server layer that moved into data centers. Web technology added SaaS beyond our data centers before virtualization and server consolidation reorganized everything into more manageable chunks.To read this article in full, please click here

US Senate Makes Moves to Reinstate Net Neutrality, But Sustainable Rules Are Still Necessary

On May 16, the Senate passed a Congressional Review Act (CRA) to overturn the Federal Communication Commission’s (FCC) repeal of the 2015 Open Internet Order. A CRA allows Congress to review regulations issued by government agencies and overrule them with a majority vote. This vote, led by Senator Ed Markey (D-MA), is a step towards reinstating the FCC’s 2015 net neutrality rules.

The CRA will now move to the House, where it will require a majority vote in order to pass before heading to President Trump’s desk for his signature. If the CRA passes the House and gets the President’s signature, the 2015 Order will be reinstated.

Despite the CRA’s success in the Senate, it is unlikely that it will pass the House. In the Senate, every Democrat, two Independents, and three Republicans were needed to pass the CRA. In the House, Democrats hold just 193 of 435 seats and would need to be joined by 25 Republican or Independent Representatives to move the CRA to the President’s desk. Even then, the bill would face another major hurdle, as President Trump has previously expressed support for overturning the FCC’s Open Internet Order.

This is not to mention the court cases Continue reading

BiB 42 – Pica8 Releases PicaPilot and PicaFabric

Pica8 makes it first steps into network automation in a unique fashion with apps for its PicOS NOS. PicaFabric build a virtual switch chassis from an leaf/spine switch clister. The PicaPilot app builds vitual switch stack for fat tree L2 everywhere campus networks. All this is done with open hardware that you can mix & […]

The post BiB 42 – Pica8 Releases PicaPilot and PicaFabric appeared first on Packet Pushers.

Building the Digital Silk Road Together: Kyrgyz Chapter Proposes Ideas for Internet Development in Central Asia at Cambridge University Forum

Central Asia, the most remote landlocked mountainous region in the world, has some of the most expensive Internet in global comparison. The cost of it can easily reach 10-20% of average monthly salary. In absolute terms, the price of the Internet can reach triple digits for 1 Mbps.

Acknowledging such challenges and considering the benefits that the Internet can bring, Central Asian governments are embarking on national digitalization strategies. The Kyrgyz Republic has launched a national program on digital transformation “Taza Koom” (“Transparent Society”). The program focuses on building an open government and a digital economy.

When it comes to digital development strategies, cooperation among countries is a mutually beneficial approach. To foster such collaboration, Cambridge University initiated a common platform called Digital Dialogue for Central Asia. The first meeting of this platform Making Inroads into Digital Transformation took place in Astana in April 2018.

Speaking at the forum on behalf of the Internet Society’s Kyrgyz Chapter, I proposed to jointly build the Digital Silk Road guided by the slogan: “free movement of ideas, people, creativity, technology and innovation”. Central Asia, with its favourable geographical location in Eurasia, could become the connecting host and focal point – a Continue reading

Using logger on Linux

The logger command provides an easy way to add log files to /var/log/syslog -- from the command line, from scripts or from other files. In today's post, we'll take a look at how it works.How easy is easy? This easy. Just type logger <message> on the command line and your message will be added to the end of the /var/log/syslog file.$ logger comment to be added to log $ tail -1 /vvar/log/syslog May 21 18:02:16 butterfly shs: comment to be added to log Command output You can also add the output from commands by enclosing the commands in backticks.$ logger `who` $ tail -1 /var/log/syslog May 21 18:02:43 butterfly shs: shs pts/0 2018-05-21 15:57 (192.168.0.15) Content from a file The contents of text files can be added by using the -f option. Put the name of the file to be added to the log following the -f option as shown below.To read this article in full, please click here

How to use logger on Linux

The logger command provides an easy way to add log files to /var/log/syslog — from the command line, from scripts, or from other files. In today's post, we'll take a look at how it works.How easy is easy? This easy. Just type logger <message> on the command line and your message will be added to the end of the /var/log/syslog file.$ logger comment to be added to log $ tail -1 /vvar/log/syslog May 21 18:02:16 butterfly shs: comment to be added to log Command output You can also add the output from commands by enclosing the commands in backticks.$ logger `who` $ tail -1 /var/log/syslog May 21 18:02:43 butterfly shs: shs pts/0 2018-05-21 15:57 (192.168.0.15) [ Two-Minute Linux Tips: Learn how to master a host of Linux commands in these 2-minute video tutorials ] Content from a file The contents of text files can be added by using the -f option. Put the name of the file to be added to the log following the -f option as shown below.To read this article in full, please click here

22 essential security commands for Linux

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