CODEWITHSUNDEEP
javascriptregex
kamaci
kamaci

Reputation: 75147

Starts With Character Does Not Match at Regex

I have a regex as like that:

/^[0-9]*.*K/

and I have a string to test:

L1/50K

and it matches. However it should match a string starts with a number? What is the explanation of that regex?

Upvotes: 0

Views: 44

Answers (3)

Avinash Raj
Avinash Raj

Reputation: 174716

Remove the * after [0-9]. * repeats the previous (token or character) zero or more times, so if no number is present at the first, ^[0-9]*.*K would match the string.

^\d\d*.*K$

OR

^\d+.*K$

OR

^\d{1,}.*K$

Use \d at the first so that it would match the strings which starts with a digit. Note \d is equal to [0-9]. $ means end of the line, use this anchor after K, so that it would match the lines which starts with a number and ends with a K

Upvotes: 0

Pieter Verloop
Pieter Verloop

Reputation: 145

a * matches 0 or more of the preceding token. if you want to force it to start with a number you should use a +, like:

/^[0-9]+.*K/

for excellent documentation on regexes, as well as build them: http://www.regexr.com/

Upvotes: 0

jood
jood

Reputation: 2397

'*' means 0 or more. You have to use +, which means 1 or more

/^[0-9]+.*K/

Upvotes: 1

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