regex basics code example

Example 1: regex usage

regex usage examples

Example 2: regex examples

[abc]            matches a string that has either an a or a b or a c -> is the same as a|b|c -> Try it![a-c]            same as previous[a-fA-F0-9]      a string that represents a single hexadecimal digit, case insensitively -> Try it![0-9]%           a string that has a character from 0 to 9 before a % sign[^a-zA-Z]        a string that has not a letter from a to z or from A to Z. In this case the ^ is used as negation of the expression -> Try it!

Example 3: regex examples

a(b|c)     matches a string that has a followed by b or c (and captures b or c) -> Try it!a[bc]      same as previous, but without capturing b or c

Example 4: regex examples

\$\d       matches a string that has a $ before one digit -> Try it!

Example 5: regex examples

^The        matches any string that starts with The -> Try it!end$        matches a string that ends with end^The end$   exact string match (starts and ends with The end)roar        matches any string that has the text roar in it