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Commit 0891699

Browse files
updates for version 1.5
1 parent f051dc5 commit 0891699

18 files changed

+3771
-508
lines changed

‎Exercise_solutions.md

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‎Exercises.md

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‎code_snippets/Alternation_and_Grouping.js

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@@ -1,3 +1,5 @@
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// OR conditional
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const pets = /cat|dog/
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pets.test('I like cats')
@@ -10,6 +12,8 @@ pets.test('I like parrots')
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'cat dog bee parrot fox'.replace(/cat|dog|fox/g, 'mammal')
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// Grouping
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'red reform read arrest'.replace(/reform|rest/g, 'X')
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'red reform read arrest'.replace(/re(form|st)/g, 'X')
@@ -20,6 +24,8 @@ pets.test('I like parrots')
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'par spare part party'.replace(/\bpar(|t)\b/g, 'X')
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// Precedence rules
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let words = 'lion elephant are rope not'
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words.replace(/on|ant/, 'X')

‎code_snippets/Anchors.js

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// String anchors
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/^cat/.test('cater')
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/^cat/.test('concatenation')
@@ -28,6 +30,8 @@ words.filter(w => /t$/.test(w))
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'hack'.replace(/$/, 'er')
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// Line anchors
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/^top/m.test('hi hello\ntop spot')
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/er$/m.test('spare\npar\nera\ndare')
@@ -44,6 +48,8 @@ console.log(items.replace(/$/gm, '.'))
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'1\n2\n'.replace(/$/mg, ' baz')
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// Word anchors
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let sample = 'par spar apparent spare part'
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sample.replace(/par/g, 'X')
@@ -54,12 +60,16 @@ sample.replace(/par\b/g, 'X')
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sample.replace(/\bpar\b/g, 'X')
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let sample = 'par spar apparent spare part'
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console.log(sample.replace(/\b/g, '"').replace(//g, ','))
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'foo_baz=num1+35*42/num2'.replace(/\b/g, ' ')
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'foo_baz=num1+35*42/num2'.replace(/\b/g, ' ').trim()
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let sample = 'par spar apparent spare part'
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sample.replace(/\Bpar/g, 'X')
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sample.replace(/\Bpar\b/g, 'X')

‎code_snippets/Character_class.js

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// Custom character sets
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['cute', 'cat', 'cot', 'coat', 'cost'].filter(w => /c[ou]t/.test(w))
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'meeting cute boat site foot'.replace(/[aeo]+t/g, 'X')
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'Sample123string42with777numbers'.match(/[0123456789]+/g)
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// Range of characters
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'Sample123string42with777numbers'.match(/[0-9]+/g)
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'coat Bin food tar12 best'.match(/\b[a-z0-9]+\b/g)
@@ -12,17 +16,7 @@
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'coat tin food put stoop best'.match(/\b[a-fp-t]+\b/g)
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'23 154 12 26 98234'.match(/\b[12][0-9]\b/g)
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'23 154 12 26 98234'.match(/\b[0-9]{3,}\b/g)
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'0501 035 154 12 26 98234'.match(/\b0*[1-9][0-9]{2,}\b/g)
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'45 349 651 593 4 204'.match(/[0-9]+/g).filter(n => n < 350)
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'45 349 651 593 4 204'.replace(/[0-9]+/g, m => m < 350 ? 0 : 1)
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'45 349 651 593 4 204'.match(/[0-9]+/g).filter(n => n >= 200 && n <= 650)
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// Negating character sets
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'Sample123string42with777numbers'.match(/[^0-9]+/g)
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@@ -38,6 +32,8 @@ words.filter(w => /^[^aeiou]+$/.test(w))
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words.filter(w => !/[aeiou]/.test(w))
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// Matching metacharacters literally
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'ab-cd gh-c 12-423'.match(/\b[a-z-]{2,}\b/g)
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'ab-cd gh-c 12-423'.match(/\b[a-z\-0-9]{2,}\b/g)
@@ -50,6 +46,8 @@ words.filter(w => !/[aeiou]/.test(w))
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console.log('5ba\\babc2'.match(/[a\\b]+/)[0])
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// Escape sequence character sets
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'Sample123string42with777numbers'.split(/\d+/)
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'sea eat car rat eel tea'.match(/\b\w/g).join('')
@@ -60,3 +58,17 @@ console.log('5ba\\babc2'.match(/[a\\b]+/)[0])
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' 1..3 \v\f foo_baz 42\tzzz \r\n1-2-3 '.match(/\S+/g)
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// Numeric ranges
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'23 154 12 26 98234'.match(/\b[12]\d\b/g)
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'23 154 12 26 98234'.match(/\b\d{3,}\b/g)
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'0501 035 154 12 26 98234'.match(/\b0*[1-9]\d{2,}\b/g)
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'45 349 651 593 4 204'.match(/\d+/g).filter(n => n < 350)
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'45 349 651 593 4 204'.replace(/\d+/g, m => m < 350 ? 0 : 1)
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'45 349 651 593 4 204'.match(/\d+/g).filter(n => n >= 200 && n <= 650)
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‎code_snippets/Dot_metacharacter_and_Quantifiers.js

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1-
'tac tin cat abc;tuv acute'.replace(/c.t/g, 'X')
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// Dot metacharacter
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'tac tin c.t abc;tuv acute'.replace(/c.t/g, 'X')
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'breadth markedly reported overrides'.replace(/r..d/g, 'X')
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'42\t33'.replace(/2.3/, '8')
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// split method
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'apple-85-mango-70'.split(/-/)
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'apple-85-mango-70'.split(/-/, 2)
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'bus:3:car:5:van'.split(/:.:/)
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// Greedy quantifiers
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'far feat flare fear'.replace(/e?ar/g, 'X')
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'par spare part party'.replace(/\bpart?\b/g, 'X')
@@ -42,6 +54,8 @@ demo.filter(w => /ab{3,}c/.test(w))
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demo.filter(w => /ab{3}c/.test(w))
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// AND Conditional
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/Error.*valid/.test('Error: not a valid input')
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/Error.*valid/.test('Error: key not found')
@@ -56,6 +70,8 @@ patterns.every(p => p.test('cat and dog'))
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patterns.every(p => p.test('dog and cat'))
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// What does greedy mean?
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'foot'.replace(/f.?o/, 'X')
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console.log('blah < foo \\< bar < baz'.replace(/\\?</g, '\\<'))
@@ -72,18 +88,26 @@ sentence.replace(/t.*a.*q.*f/, 'X')
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sentence.replace(/t.*a.*u/, 'X')
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// Non-greedy quantifiers
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'foot'.replace(/f.??o/, 'X')
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'frost'.replace(/f.??o/, 'X')
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'123456789'.replace(/.{2,5}?/, 'X')
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'green:3.14:teal::brown:oh!:blue'.split(/:.*?:/)
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let sentence = 'that is quite a fabricated tale'
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sentence.replace(/t.*?a/, 'X')
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'star'.replace(/t.*?a/, 'X')
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sentence.replace(/t.*?a.*?f/, 'X')
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// s flag
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'Hi there\nHave a Nice Day'.replace(/the.*ice/, 'X')
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'Hi there\nHave a Nice Day'.replace(/the.*ice/s, 'X')

‎code_snippets/Escaping_metacharacters.js

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// Escaping with \
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/b^2/.test('a^2 + b^2 - C*3')
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/b\^2/.test('a^2 + b^2 - C*3')
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'\\learn\\by\\example'.replace(/\\/g, '/')
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// Dynamically escaping metacharacters
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function escapeRegExp(string) {
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return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
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return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&')
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}
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let eqn = 'f*(a^b) - 3*(a^b)'
@@ -22,6 +26,8 @@ eqn.replace(pat, 'c')
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eqn.replace(new RegExp(escapeRegExp(usr_str) + '$'), 'c')
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// Dynamically building alternation
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function unionRegExp(arr) {
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return arr.map(w => escapeRegExp(w)).join('|')
2733
}
@@ -44,6 +50,8 @@ p2
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'handful handed handy hands hand'.replace(p2, 'X')
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// source and flags properties
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const p3 = /\bpar\b/
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const p4 = new RegExp(p3.source + '|cat', 'g')
@@ -56,9 +64,33 @@ p4.flags
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'cater cat concatenate par spare'.replace(p4, 'X')
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let path = '/foo/123/foo/baz/ip.txt'
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// Escaping delimiter
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let path = '/abc/123/foo/baz/ip.txt'
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path.replace(/^\/abc\/123\//, '~/')
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path.replace(new RegExp(`^/abc/123/`), '~/')
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// Escape sequences
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'a\tb\tc'.replace(/\t/g, ':')
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'1\n2\n3'.replace(/\n/g, ' ')
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new RegExp('123\tabc')
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new RegExp('123\\tabc')
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new RegExp('car\b')
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new RegExp('car\\b')
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/\e/.test('hello')
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'h e l l o'.replace(/\x20/g, '')
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path.replace(/^\/foo\/123\//, '~/')
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'12|30'.replace(/2\x7c3/g, '5')
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path.replace(newRegExp(`^/foo/123/`), '~/')
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'12|30'.replace(/2|3/g, '5')
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‎code_snippets/Groupings_and_backreferences.js

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1-
'[52] apples and [31] mangoes'.replace(/\[(\d+)\]/g, '1ドル')
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// Backreferences
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'[52] apples [and] [31] mangoes'.replace(/\[(\d+)\]/g, '1ドル')
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'_foo_ __123__ _baz_'.replace(/(_)?_/g, '1ドル')
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@@ -16,12 +18,20 @@ words.filter(w => /(\w)1円/.test(w))
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'aa a a a 42 f_1 f_1 f_13.14'.replace(/\b(\w+)(1円)+\b/g, '1ドル')
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// Backreference oddities
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'cat'.replace(/a/, '{1ドル}')
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'cat'.replace(/(a)/, '{\1ドル}')
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'cat'.replace(/(a)/, '{$1ドル}')
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'[52] apples and [31] mangoes'.replace(/\[(\d+)\]/g, '(15ドル)')
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'[52] apples and [31] mangoes'.replace(/\[(\d+)\]/g, '3ドル')
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'[52] apples and [31] mangoes'.replace(/\[\d+\]/g, '1ドル')
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'abcdefghijklmn'.replace(/(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)/, '11ドル')
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'abcdefghijklmn'.replace(/(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)/, '1ドル\x31')
@@ -30,12 +40,16 @@ words.filter(w => /(\w)1円/.test(w))
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'abcdefghijklmna1d'.replace(/(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.).*1円\x31/, 'X')
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// Non-capturing groups
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'Sample123string42with777numbers'.split(/\d+/)
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'Sample123string42with777numbers'.split(/(\d+)/)
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'effort flee facade oddball rat tool'.match(/\b\w*(\w)1円\w*\b/g)
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'hi 123123123 bye 456123456'.match(/(123)+/g)
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'123hand42handy777handful500'.split(/hand(y|ful)?/)
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'123hand42handy777handful500'.split(/hand(?:y|ful)?/)
@@ -48,6 +62,8 @@ words.filter(w => /(\w)1円/.test(w))
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'so:cat:rest:in:put:to'.replace(/^((?:[^:]+:){4})/, '(1ドル)')
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// Named capture groups
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let row = 'today,2008年03月24日,food,2008年03月24日,nice,2018年10月25日,5632'
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row.match(/(?<date>\d{4}-\d{2}-\d{2}).*\k<date>/)[0]

‎code_snippets/Interlude_Common_tasks.js

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// CommonRegexJS
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let data = 'hello 255.21.255.22 okay'
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const comm = new CommonRegex(data)
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comm.IPv4
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let new_data = '23.14.2.4.2 255.21.255.22 567.12.2.1'
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const ip = new CommonRegex(new_data)
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ip.IPv4
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