Speech and Language Processing - Deepstash
The Psychology of Willpower

Learn more about scienceandnature with this collection

How to strengthen your willpower

How to overcome temptation and distractions

The role of motivation in willpower

The Psychology of Willpower

Discover 57 similar ideas in

It takes just

8 mins to read

Natural Language Processing: Regular Expressions

  • /word/ - matches any string containing the substring "word". Note: it's case sensitive.
  • /[ab]/ - disjunction of characters: "a" or" b"
  • /cat|dog/ - disjunction of string cat and dog. To be read as: String containing "cat" or "dog"
  • /pupp(y|ies)/ - To be read as: string containing "puppy" or "puppies"
  • /[a-z]/ - shows an interval: any letter between "a" and "z"
  • /[^a] / - "^" shows negation when it's the first character inside brackets. To be read as: not containing "a"
  • /^The/ - Here "^" matches only the string which starts with the expression that follows it. E.g. The dog barks.
  • /s.$/ - "$" matches the end of the line. E.g. expression that matches any string ending with .s
  • /words?/ - "?" implies zero or one instances of the previous character. E.g. word or words
  • /b.y/ - "." shows any character between b and y. E.g. for the expression "busy life", the answer would be "us"
  • /a*/ - "*" shows any string of 0 or more "a"'s. To be read as: "String containing no a's or 1 ore more a's
  • /[ab+] / - "+" shows 1 ore more occurences of the previous character. To be read as:Any character containing 1 ore more ab's.
  • /\bthe \b/ / "\b" matches a word boundary. To be read as "matches a string which contains "the" isolated by other words. E.g. "in the club" but not "the other", 
  •  \d - contains any digit
  • \D - contains any non-digit
  • {n} - n occurences of the previous char or expression
  • {,n} - up to n occurences of the previous char or expresssion
  • {n, m) - from n to m occurences of the previous char or expression


12 reads

Natural Language Processing: Word Formation

Morphology is the study of word structure.

Words consist of one or more morphemes (cats= cat+ s). A morpheme is the smallest unit of language.

Morphemes can be of several types:

  • stem (can stand on its own)
  • affix (can't stand on its own)

Word formation can develop through:

  • inflection: forms of the same word. E.g. word, words; work, worked
  • derivation: not applicable to all words in a class; the meaning changes: e.g. act -> actor
  • compunds: stardust = star + dust
  • clitisication: word + clitic. E.g.: we're, you're

For counting words:

  • tokens: distinct occurences of word strings
  • types: distinct words

Lemmatization is a vocabulary reduction process of mapping words to their stem. E.g. sang, sung, sings to sing  

Stemming is the process of reducing words to stems. E.g. information to inform, retrieval to retriev

Types of errors:

  • ommision: related words are not reduced to the same stem. E.g. European and Europe
  • commision: unrelated words reduced to the same stems. E.g. policy and police are reduced to polic 

Note: look at Minimum Distance Algorithm to determine the distance between words


21 reads



User Researcher, passionate about behaviours and building the right products. I 'stash' about research, self-development and education.


Explore the World’s

Best Ideas

200,000+ ideas on pretty much any topic. Created by the smartest people around & well-organized so you can explore at will.

An Idea for Everything

Explore the biggest library of insights. And we've infused it with powerful filtering tools so you can easily find what you need.

Knowledge Library

Powerful Saving & Organizational Tools

Save ideas for later reading, for personalized stashes, or for remembering it later.

# Personal Growth

Take Your Ideas


Organize your ideas & listen on the go. And with Pro, there are no limits.

Listen on the go

Just press play and we take care of the words.

Never worry about spotty connections

No Internet access? No problem. Within the mobile app, all your ideas are available, even when offline.

Get Organized with Stashes

Ideas for your next work project? Quotes that inspire you? Put them in the right place so you never lose them.


2 Million Stashers


5,740 Reviews

App Store


72,690 Reviews

Google Play

Sean Green

Great interesting short snippets of informative articles. Highly recommended to anyone who loves information and lacks patience.


Don’t look further if you love learning new things. A refreshing concept that provides quick ideas for busy thought leaders.

Shankul Varada

Best app ever! You heard it right. This app has helped me get back on my quest to get things done while equipping myself with knowledge everyday.

Ashley Anthony

This app is LOADED with RELEVANT, HELPFUL, AND EDUCATIONAL material. It is creatively intellectual, yet minimal enough to not overstimulate and create a learning block. I am exceptionally impressed with this app!

Jamyson Haug

Great for quick bits of information and interesting ideas around whatever topics you are interested in. Visually, it looks great as well.

Laetitia Berton

I have only been using it for a few days now, but I have found answers to questions I had never consciously formulated, or to problems I face everyday at work or at home. I wish I had found this earlier, highly recommended!

Giovanna Scalzone

Brilliant. It feels fresh and encouraging. So many interesting pieces of information that are just enough to absorb and apply. So happy I found this.

Ghazala Begum

Even five minutes a day will improve your thinking. I've come across new ideas and learnt to improve existing ways to become more motivated, confident and happier.

Read & Learn

20x Faster





Access to 200,000+ ideas

Access to the mobile app

Unlimited idea saving & library

Unlimited history

Unlimited listening to ideas

Downloading & offline access

Personalized recommendations

Supercharge your mind with one idea per day

Enter your email and spend 1 minute every day to learn something new.


I agree to receive email updates