CODEWITHSUNDEEP
regex
Suragch
Suragch

Reputation: 512726

Regex match any single character (one character only)

How do you match any one character with a regular expression?

A number of other questions on Stack Overflow sound like they promise a quick answer, but they are actually asking something more specific:

Upvotes: 82

Views: 404315

Answers (3)

Rafey Rana
Rafey Rana

Reputation: 51

If you are searching for a single isolated character or a set of isolated characters within any string you can use this

\b[a-zA-Z]\s

this will find all single english characters in the string

similarly use

\b[0-9]\s

to find single digits like it will pick 9 but not 98 and so on

Upvotes: 2

Suragch
Suragch

Reputation: 512726

Match any single character

  • Use the dot . character as a wildcard to match any single character.

Example regex: a.c

abc   // match
a c   // match
azc   // match
ac    // no match
abbc  // no match

Match any specific character in a set

  • Use square brackets [] to match any characters in a set.
  • Use \w to match any single alphanumeric character: 0-9, a-z, A-Z, and _ (underscore).
  • Use \d to match any single digit.
  • Use \s to match any single whitespace character.

Example 1 regex: a[bcd]c

abc   // match
acc   // match
adc   // match
ac    // no match
abbc  // no match

Example 2 regex: a[0-7]c

a0c   // match
a3c   // match
a7c   // match
a8c   // no match
ac    // no match
a55c  // no match

Match any character except ...

Use the hat in square brackets [^] to match any single character except for any of the characters that come after the hat ^.

Example regex: a[^abc]c

aac   // no match
abc   // no match
acc   // no match
a c   // match
azc   // match
ac    // no match
azzc  // no match

(Don't confuse the ^ here in [^] with its other usage as the start of line character: ^ = line start, $ = line end.)

Match any character optionally

Use the optional character ? after any character to specify zero or one occurrence of that character. Thus, you would use .? to match any single character optionally.

Example regex: a.?c

abc   // match
a c   // match
azc   // match
ac    // match
abbc  // no match

See also

Upvotes: 112

Daniel Perník
Daniel Perník

Reputation: 5882

Simple answer

If you want to match single character, put it inside those brackets [ ]

Examples

  • match + ...... [+] or +
  • match a ...... a
  • match & ...... &

...and so on. You can check your regular expresion online on this site: https://regex101.com/

(updated based on comment)

Upvotes: 5

Related Questions