What does /i at the end of a regex mean?

Question

What is the meaning of /i at the tail of this regex?

var time = /^([1-9]|1[0-9]):([0-5][0-9])(\s[a|p]m)$/i;

Note that [a|p] matches a, | or p (yes, the | as well!). Inside a character set, the pipe has no special meaning. So you'll probably want to do: [ap]m which matches am or pm. — Bart Kiers
– Bart Kiers, Commented Feb 11, 2011 at 9:33
Also, you first part ([1-9]|1[0-9]) will only match '1', '2', '3', ... , '19'. Is that correct? — Bart Kiers
– Bart Kiers, Commented Feb 11, 2011 at 9:41
@Bart: Thanks. Now if I want digits-digits i.e xxxx-xx i.e n digits n then - and then one or two digits, my regex will look like this? /^\d+-\d{1,2}$/ or something else? — Some Java Guy
– Some Java Guy, Commented Feb 11, 2011 at 9:57
@Bart: I need your input here (stackoverflow.com/questions/4966520/…) — Some Java Guy
– Some Java Guy, Commented Feb 11, 2011 at 10:47

Sachin Shanbhag · Accepted Answer · 2011-02-11 09:24:09Z

89

/i stands for ignore case in the given string. Usually referred to as case-insensitive as pointed out in the comment.

answered Feb 11, 2011 at 9:24

Sachin Shanbhag

55.7k11 gold badges92 silver badges103 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Piskvor left the building Over a year ago

usually referred to as case-insensitive

T.J. Crowder Over a year ago

@oneofthelions: Full syntax is readily available in the spec: ecma-international.org/publications/standards/Ecma-262.htm And there might be the odd website or two providing JavaScript regular expressions info in more accessible language.

Sachin Shanbhag Over a year ago

@Piskvor - yes, thanks. I totally forgot that word and had type incase-sensitive..:) Have edited my answer for this.

KooiInc · Accepted Answer · 2011-02-11 09:41:33Z

It's, like Sachin Shanbhag already answered the 'ignore case' modifier. So /[a-z]/i is equal to /[a-zA-Z]/. Check this link for other modifiers.

Collectives™ on Stack Overflow

What does /i at the end of a regex mean?

2 Answers 2

3 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Linked

Related