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| What is the regular expression equal to "Match any digit you find in the range 0 through 9."? |
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| This will match what: [0-9][0-9][0-9]-[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9] |
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| This will match what: [0-9] |
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| A single digit from 0 to 9. |
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| A simpler (shorthand) way of typing [0-9] is to type: |
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| This will match what: \d\d\d-\d\d\d-\d\d\d\d |
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| The _____ essentially acts as a wildcard and will match any character. |
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| A part of a pattern can be enclosed in parentheses (...). This is called a _____. |
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| A _____ refers back to what was captured in the group enclosed by parentheses. |
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| The \1 in this regular expression is called a what? And what does it do: (\d)\d\1 |
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| A "backreference"; it references the \d in the parenthesis. |
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| What is '{3}' portion called in this regular expression: \d{3} |
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| It's called a "quantifier" and it represents the number of occurrences of whatever is matched in front of it. |
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| The question mark (?) quantifier immediately following a character means what? |
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| "match zero or one instance of this character". |
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| What is the expression for matching non-word characters? (whitespace, punctuation, special characters) |
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| What will this expression match: \b |
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| \b allows you to perform a "whole words only" search using a regular expression in the form of \bword\b. |
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| What will this expression match: [\b] |
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| What will this expression match: \cX |
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| ASCII control character; the second letter is an uppercase letter A through Z, to indicate Control+A through Control+Z. |
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| What will this expression match: \t |
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| horizontal tab character; ASCII 0x09 |
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| What will this expression match: \r |
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| carriage return; ASCII 0x0D |
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| What will this expression match: \n |
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Definition
| new line character; ASCII 0x0A |
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| What will this expression match: \R |
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| A special escape that matches any line break, including Unicode line breaks. What makes it special is that it treats CR\LF pairs as indivisible. |
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| What will this expression match: \xHH |
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Definition
| Hexidecimal ASCII characters (replace <HH> with 2-digit hex value). "A" is 41 in hex, so "\x41" will match all capital A's. |
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| What will this expression match: \s |
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| What will this expression match: \w |
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| What will this expression match: \W |
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| What will this expression match: \0 |
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| What will this expression match: [^\s\t\n\r] |
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Definition
| Every character that is NOT a space, a tab, a newline, or carriage return. |
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| What will this expression match: ^The |
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Definition
| matches any string that starts with "The" |
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| What will this expression match: end$ |
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Definition
| matches a string that ends with "end" |
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| What will this expression match: ^The end$ |
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Definition
| exact string match; starts and ends with "The end". |
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| What will this string match: ing |
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Definition
| Matches any string that has the text "ing" anywhere in it. |
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| What will this expression match: abc* |
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Definition
| Matches a string that has "ab" followed by zero or more characters. |
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Term
| What will this expression match: (?i)the (?=horse) |
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Definition
| It's a "Positive Lookahead"; every instance of "the" that is also followed by the word "horse". |
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| What will this expression match: (?i)the (?!horse) |
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Definition
| It's a "Negative Lookahead"; every instance of "the" that is NOT followed by the word "horse". |
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| What will this expression match: ^alpha |
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Definition
| It will match the word alpha, but only if it occurs at the very beginning of the subject text. |
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| What will this expression match: there$ |
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Definition
| The word "there" IF it's at the end of a line. |
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| The regular expression tokens ‹^›, ‹$›, ‹\A›, ‹\Z›, and ‹\z› are called _____. |
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| What will this expression match: \band\ |
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| It will match the word "and" by itself, but not the letters as part of a larger word. |
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| What will this expression match: \Band\B |
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Definition
| It will match the letters a-n-d as part of a word, but not the word "and" by itself. |
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| What will this expression match: \b(?i:Jim|James|Jimmy)\b |
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Definition
| It will match all instances of "Jim", "James", or "Jimmy". |
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| What will this expression match: \b[a-f0-9]{1,8}\b |
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| What will this expression match: \bcolou?r\b |
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| It will match "color" or "colour". |
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| What will this expression match: \b[bcr]at\b |
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| What will this expression match: \b\w*phobia\b |
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Definition
| Words ending with “phobia” |
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| What will this expression match: \bSte(?:ven?|phen)\b |
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Definition
| Steve, Steven, or Stephen |
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| What will this expression match: \b(?!cat\b)\w+ |
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| Find every instance of the letters c-a-t, except the word "cat". |
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| What will this expression match: \b(?:(?!cat)\w)+\b |
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Definition
| Matches any word that does NOT contain c-a-t |
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| What will this expression match: \b([A-Z]+)\s+\1\b |
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Definition
| Repeated words (like "the the"). |
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Term
| The notation using square brackets is called a _____ and it matches a single character out of a list of possible characters. |
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| A _____ negates a character class if you place it immediately after the opening bracket. |
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| A _____ creates a range when it is placed between two characters. |
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| What will this expression match: /^[a-z0-9_-]{3,16}$/ |
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Definition
| It will match a username with three to sixteen characters, having letters, numbers, underscores, and hyphens. |
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