Determine whether a string contains a space or reaches its end

Question

Determine whether a string contains a space or reaches its end

Looking to identify whether a string contains a space or end-of-string character. Let's take the following example string:

var elem="tisof tisoff tiso"

The goal is to determine if the input "tiso" exists within this string, regardless of its position. To create a regular expression for this, we can use:

var regex=new RegExp(/.*tiso\s/);

However, when testing this regex with the elem variable, it returns false. It seems like we need to include (\s or an end-of-string character) in the expression. Any insights on how to adjust this?

javascript regex string

Answer 1

Answer №1

To search for a specific pattern with an alternative ending, you can utilize the following regular expression: (?:\s|$):

var regex= /.*tiso(?:\s|$)/;

The use of (?:...) creates a non-capturing group that simply groups alternatives without creating separate capture groups. If you do not need to reference the capture group later, you can remove the ?: part. In this case, (?:\s|$) will match either a whitespace character or the end of the string.

IMPORTANT: To match the whole word "tiso", you can employ the regex pattern /\btiso\b/. Here, \b signifies a word boundary. The first \b before the letter "t" demands that it must be preceded by a non-word character or the beginning of the string. Similarly, the second \b after the letter "o" requires a non-word character or the end of the string to follow.

Answer 2

To search for a specific pattern with an alternative ending, you can utilize the following regular expression: (?:\s|$):

var regex= /.*tiso(?:\s|$)/;

The use of (?:...) creates a non-capturing group that simply groups alternatives without creating separate capture groups. If you do not need to reference the capture group later, you can remove the ?: part. In this case, (?:\s|$) will match either a whitespace character or the end of the string.

IMPORTANT: To match the whole word "tiso", you can employ the regex pattern /\btiso\b/. Here, \b signifies a word boundary. The first \b before the letter "t" demands that it must be preceded by a non-word character or the beginning of the string. Similarly, the second \b after the letter "o" requires a non-word character or the end of the string to follow.

Determine whether a string contains a space or reaches its end

Answer №1

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