9. What are regular expressions ? How arethey useful?

1.	9. What are regular expressions ? How arethey useful?
Answer» ANSWER: ʀᴇɢᴜʟᴀʀ ᴇxᴘʀᴇssɪᴏɴs ᴀʀᴇ ᴀ sʏsᴛᴇᴍ ғᴏʀ ᴍᴀᴛᴄʜɪɴɢ ᴘᴀᴛᴛᴇʀɴs ɪɴ ᴛᴇxᴛ ᴅᴀᴛᴀ, ᴡʜɪᴄʜ ᴀʀᴇ ᴡɪᴅᴇʟʏ ᴜsᴇᴅ ɪɴ ᴜɴɪx sʏsᴛᴇᴍs, ᴀɴᴅ ᴏᴄᴄᴀsɪᴏɴᴀʟʟʏ ᴏɴ ᴘᴇʀsᴏɴᴀʟ ᴄᴏᴍᴘᴜᴛᴇʀs ᴀs ᴡᴇʟʟ. ᴛʜᴇʏ ᴘʀᴏᴠɪᴅᴇ ᴀ ᴠᴇʀʏ ᴘᴏᴡᴇʀғᴜʟ, ʙᴜᴛ ᴀʟsᴏ ʀᴀᴛʜᴇʀ ᴏʙᴛᴜsᴇ, sᴇᴛ ᴏғ ᴛᴏᴏʟs ғᴏʀ ғɪɴᴅɪɴɢ ᴘᴀʀᴛɪᴄᴜʟᴀʀ ᴡᴏʀᴅs ᴏʀ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴏғ ᴄʜᴀʀᴀᴄᴛᴇʀs ɪɴ sᴛʀɪɴɢs.

Answer»

ʀᴇɢᴜʟᴀʀ ᴇxᴘʀᴇssɪᴏɴs ᴀʀᴇ ᴀ sʏsᴛᴇᴍ ғᴏʀ ᴍᴀᴛᴄʜɪɴɢ ᴘᴀᴛᴛᴇʀɴs ɪɴ ᴛᴇxᴛ ᴅᴀᴛᴀ, ᴡʜɪᴄʜ ᴀʀᴇ ᴡɪᴅᴇʟʏ ᴜsᴇᴅ ɪɴ ᴜɴɪx sʏsᴛᴇᴍs, ᴀɴᴅ ᴏᴄᴄᴀsɪᴏɴᴀʟʟʏ ᴏɴ ᴘᴇʀsᴏɴᴀʟ ᴄᴏᴍᴘᴜᴛᴇʀs ᴀs ᴡᴇʟʟ. ᴛʜᴇʏ ᴘʀᴏᴠɪᴅᴇ ᴀ ᴠᴇʀʏ ᴘᴏᴡᴇʀғᴜʟ, ʙᴜᴛ ᴀʟsᴏ ʀᴀᴛʜᴇʀ ᴏʙᴛᴜsᴇ, sᴇᴛ ᴏғ ᴛᴏᴏʟs ғᴏʀ ғɪɴᴅɪɴɢ ᴘᴀʀᴛɪᴄᴜʟᴀʀ ᴡᴏʀᴅs ᴏʀ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴏғ ᴄʜᴀʀᴀᴄᴛᴇʀs ɪɴ sᴛʀɪɴɢs.

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9. What are regular expressions ? How arethey useful?​

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9. What are regular expressions ? How arethey useful?