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Regular Expressions in JavaScript

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Matching Character Ranges

1:58 with Joel Kraft

Learn match ranges of characters such as a-z, A-Z or 0-9.

Practice

Copy each set of test strings into a Regex tester like RegEx Pal or regex101. Using what you've learned so far, create a regular expression that will match all of the strings in the set.

1 )
bat
cat
data
eat
fast
2 )
1 a
2 a
3 a
4 a
5 a
8 a
9 b
3 )
8345 Gable
7238 Gable
2349 Table
8475 Cable
0994 Fable
1047 Zable
4 )
4849
4472
4901
40502
43470
40496

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    You can also match a range of characters like A to Z, or 0:00
    a range of numbers like zero to nine in character sets. 0:04
    Let's say instead of matching just these three characters for example, 0:07
    you want to match any character in the alphabet. 0:12
    This can be done by replacing the contents of the brackets with A-Z. 0:15
    This hyphen tells the parser to include all letters in the range from A to Z. 0:20
    You can see below that only one of the strings is highlighted. 0:24
    That's because we've only specified uppercase characters. 0:30
    To include all lower case letters, we can put another range right next to the first. 0:33
    So ranges are put right next to each other in the square brackets. 0:39
    Notice, all the strings are highlighted again. 0:43
    That's because the ranges we just entered include the ts and 0:46
    js these strings start with. 0:50
    I'll just change one of these ts to a z. 0:52
    It's still matched. 0:57
    Now, I'll change it to a capital S, cool. 0:58
    I'll change it back to a t. 1:01
    I just wanna show you that you can use numerals the same way. 1:04
    I'll create a new character set at the beginning of the expression, 1:08
    followed by a space. 1:12
    Inside I'll put 0 through 7. 1:14
    All our tests are unmatched now because the parser is looking for 1:16
    the string to start with a numeral between 0 and 7. 1:19
    I'll type a 2 on the second line, followed by a space, and it's matched. 1:22
    I'll replace it with a 9. 1:30
    And it's unmatched. 1:33
    Note, I can still enter individual characters I want to match in a set. 1:35
    For example, let's say I want to match the letter a. 1:39
    I can type it in the set and then use it on the first line. 1:43
    It matches. 1:48
    Try some of the exercises in the teacher's notes for more practice. 1:49
    Next, let's look at more concise ways to express common character sets. 1:53

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